public/javascripts/prototype.js

   1 /*  Prototype JavaScript framework, version 1.6.0.3
   2  *  (c) 2005-2008 Sam Stephenson
   3  *
   4  *  Prototype is freely distributable under the terms of an MIT-style license.
   5  *  For details, see the Prototype web site: http://www.prototypejs.org/
   6  *
   7  *--------------------------------------------------------------------------*/
   8
   9 var Prototype = {
  10   Version: '1.6.0.3',
  11
  12   Browser: {
  13     IE:     !!(window.attachEvent &&
  14       navigator.userAgent.indexOf('Opera') === -1),
  15     Opera:  navigator.userAgent.indexOf('Opera') > -1,
  16     WebKit: navigator.userAgent.indexOf('AppleWebKit/') > -1,
  17     Gecko:  navigator.userAgent.indexOf('Gecko') > -1 &&
  18       navigator.userAgent.indexOf('KHTML') === -1,
  19     MobileSafari: !!navigator.userAgent.match(/Apple.*Mobile.*Safari/)
  20   },
  21
  22   BrowserFeatures: {
  23     XPath: !!document.evaluate,
  24     SelectorsAPI: !!document.querySelector,
  25     ElementExtensions: !!window.HTMLElement,
  26     SpecificElementExtensions:
  27       document.createElement('div')['__proto__'] &&
  28       document.createElement('div')['__proto__'] !==
  29         document.createElement('form')['__proto__']
  30   },
  31
  32   ScriptFragment: '<script[^>]*>([\\S\\s]*?)<\/script>',
  33   JSONFilter: /^\/\*-secure-([\s\S]*)\*\/\s*$/,
  34
  35   emptyFunction: function() { },
  36   K: function(x) { return x }
  37 };
  38
  39 if (Prototype.Browser.MobileSafari)
  40   Prototype.BrowserFeatures.SpecificElementExtensions = false;
  41
  42
  43 /* Based on Alex Arnell's inheritance implementation. */
  44 var Class = {
  45   create: function() {
  46     var parent = null, properties = $A(arguments);
  47     if (Object.isFunction(properties[0]))
  48       parent = properties.shift();
  49
  50     function klass() {
  51       this.initialize.apply(this, arguments);
  52     }
  53
  54     Object.extend(klass, Class.Methods);
  55     klass.superclass = parent;
  56     klass.subclasses = [];
  57
  58     if (parent) {
  59       var subclass = function() { };
  60       subclass.prototype = parent.prototype;
  61       klass.prototype = new subclass;
  62       parent.subclasses.push(klass);
  63     }
  64
  65     for (var i = 0; i < properties.length; i++)
  66       klass.addMethods(properties[i]);
  67
  68     if (!klass.prototype.initialize)
  69       klass.prototype.initialize = Prototype.emptyFunction;
  70
  71     klass.prototype.constructor = klass;
  72
  73     return klass;
  74   }
  75 };
  76
  77 Class.Methods = {
  78   addMethods: function(source) {
  79     var ancestor   = this.superclass && this.superclass.prototype;
  80     var properties = Object.keys(source);
  81
  82     if (!Object.keys({ toString: true }).length)
  83       properties.push("toString", "valueOf");
  84
  85     for (var i = 0, length = properties.length; i < length; i++) {
  86       var property = properties[i], value = source[property];
  87       if (ancestor && Object.isFunction(value) &&
  88           value.argumentNames().first() == "$super") {
  89         var method = value;
  90         value = (function(m) {
  91           return function() { return ancestor[m].apply(this, arguments) };
  92         })(property).wrap(method);
  93
  94         value.valueOf = method.valueOf.bind(method);
  95         value.toString = method.toString.bind(method);
  96       }
  97       this.prototype[property] = value;
  98     }
  99
 100     return this;
 101   }
 102 };
 103
 104 var Abstract = { };
 105
 106 Object.extend = function(destination, source) {
 107   for (var property in source)
 108     destination[property] = source[property];
 109   return destination;
 110 };
 111
 112 Object.extend(Object, {
 113   inspect: function(object) {
 114     try {
 115       if (Object.isUndefined(object)) return 'undefined';
 116       if (object === null) return 'null';
 117       return object.inspect ? object.inspect() : String(object);
 118     } catch (e) {
 119       if (e instanceof RangeError) return '...';
 120       throw e;
 121     }
 122   },
 123
 124   toJSON: function(object) {
 125     var type = typeof object;
 126     switch (type) {
 127       case 'undefined':
 128       case 'function':
 129       case 'unknown': return;
 130       case 'boolean': return object.toString();
 131     }
 132
 133     if (object === null) return 'null';
 134     if (object.toJSON) return object.toJSON();
 135     if (Object.isElement(object)) return;
 136
 137     var results = [];
 138     for (var property in object) {
 139       var value = Object.toJSON(object[property]);
 140       if (!Object.isUndefined(value))
 141         results.push(property.toJSON() + ': ' + value);
 142     }
 143
 144     return '{' + results.join(', ') + '}';
 145   },
 146
 147   toQueryString: function(object) {
 148     return $H(object).toQueryString();
 149   },
 150
 151   toHTML: function(object) {
 152     return object && object.toHTML ? object.toHTML() : String.interpret(object);
 153   },
 154
 155   keys: function(object) {
 156     var keys = [];
 157     for (var property in object)
 158       keys.push(property);
 159     return keys;
 160   },
 161
 162   values: function(object) {
 163     var values = [];
 164     for (var property in object)
 165       values.push(object[property]);
 166     return values;
 167   },
 168
 169   clone: function(object) {
 170     return Object.extend({ }, object);
 171   },
 172
 173   isElement: function(object) {
 174     return !!(object && object.nodeType == 1);
 175   },
 176
 177   isArray: function(object) {
 178     return object != null && typeof object == "object" &&
 179       'splice' in object && 'join' in object;
 180   },
 181
 182   isHash: function(object) {
 183     return object instanceof Hash;
 184   },
 185
 186   isFunction: function(object) {
 187     return typeof object == "function";
 188   },
 189
 190   isString: function(object) {
 191     return typeof object == "string";
 192   },
 193
 194   isNumber: function(object) {
 195     return typeof object == "number";
 196   },
 197
 198   isUndefined: function(object) {
 199     return typeof object == "undefined";
 200   }
 201 });
 202
 203 Object.extend(Function.prototype, {
 204   argumentNames: function() {
 205     var names = this.toString().match(/^[\s\(]*function[^(]*\(([^\)]*)\)/)[1]
 206       .replace(/\s+/g, '').split(',');
 207     return names.length == 1 && !names[0] ? [] : names;
 208   },
 209
 210   bind: function() {
 211     if (arguments.length < 2 && Object.isUndefined(arguments[0])) return this;
 212     var __method = this, args = $A(arguments), object = args.shift();
 213     return function() {
 214       return __method.apply(object, args.concat($A(arguments)));
 215     }
 216   },
 217
 218   bindAsEventListener: function() {
 219     var __method = this, args = $A(arguments), object = args.shift();
 220     return function(event) {
 221       return __method.apply(object, [event || window.event].concat(args));
 222     }
 223   },
 224
 225   curry: function() {
 226     if (!arguments.length) return this;
 227     var __method = this, args = $A(arguments);
 228     return function() {
 229       return __method.apply(this, args.concat($A(arguments)));
 230     }
 231   },
 232
 233   delay: function() {
 234     var __method = this, args = $A(arguments), timeout = args.shift() * 1000;
 235     return window.setTimeout(function() {
 236       return __method.apply(__method, args);
 237     }, timeout);
 238   },
 239
 240   defer: function() {
 241     var args = [0.01].concat($A(arguments));
 242     return this.delay.apply(this, args);
 243   },
 244
 245   wrap: function(wrapper) {
 246     var __method = this;
 247     return function() {
 248       return wrapper.apply(this, [__method.bind(this)].concat($A(arguments)));
 249     }
 250   },
 251
 252   methodize: function() {
 253     if (this._methodized) return this._methodized;
 254     var __method = this;
 255     return this._methodized = function() {
 256       return __method.apply(null, [this].concat($A(arguments)));
 257     };
 258   }
 259 });
 260
 261 Date.prototype.toJSON = function() {
 262   return '"' + this.getUTCFullYear() + '-' +
 263     (this.getUTCMonth() + 1).toPaddedString(2) + '-' +
 264     this.getUTCDate().toPaddedString(2) + 'T' +
 265     this.getUTCHours().toPaddedString(2) + ':' +
 266     this.getUTCMinutes().toPaddedString(2) + ':' +
 267     this.getUTCSeconds().toPaddedString(2) + 'Z"';
 268 };
 269
 270 var Try = {
 271   these: function() {
 272     var returnValue;
 273
 274     for (var i = 0, length = arguments.length; i < length; i++) {
 275       var lambda = arguments[i];
 276       try {
 277         returnValue = lambda();
 278         break;
 279       } catch (e) { }
 280     }
 281
 282     return returnValue;
 283   }
 284 };
 285
 286 RegExp.prototype.match = RegExp.prototype.test;
 287
 288 RegExp.escape = function(str) {
 289   return String(str).replace(/([.*+?^=!:${}()|[\]\/\\])/g, '\\$1');
 290 };
 291
 292 /*--------------------------------------------------------------------------*/
 293
 294 var PeriodicalExecuter = Class.create({
 295   initialize: function(callback, frequency) {
 296     this.callback = callback;
 297     this.frequency = frequency;
 298     this.currentlyExecuting = false;
 299
 300     this.registerCallback();
 301   },
 302
 303   registerCallback: function() {
 304     this.timer = setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
 305   },
 306
 307   execute: function() {
 308     this.callback(this);
 309   },
 310
 311   stop: function() {
 312     if (!this.timer) return;
 313     clearInterval(this.timer);
 314     this.timer = null;
 315   },
 316
 317   onTimerEvent: function() {
 318     if (!this.currentlyExecuting) {
 319       try {
 320         this.currentlyExecuting = true;
 321         this.execute();
 322       } finally {
 323         this.currentlyExecuting = false;
 324       }
 325     }
 326   }
 327 });
 328 Object.extend(String, {
 329   interpret: function(value) {
 330     return value == null ? '' : String(value);
 331   },
 332   specialChar: {
 333     '\b': '\\b',
 334     '\t': '\\t',
 335     '\n': '\\n',
 336     '\f': '\\f',
 337     '\r': '\\r',
 338     '\\': '\\\\'
 339   }
 340 });
 341
 342 Object.extend(String.prototype, {
 343   gsub: function(pattern, replacement) {
 344     var result = '', source = this, match;
 345     replacement = arguments.callee.prepareReplacement(replacement);
 346
 347     while (source.length > 0) {
 348       if (match = source.match(pattern)) {
 349         result += source.slice(0, match.index);
 350         result += String.interpret(replacement(match));
 351         source  = source.slice(match.index + match[0].length);
 352       } else {
 353         result += source, source = '';
 354       }
 355     }
 356     return result;
 357   },
 358
 359   sub: function(pattern, replacement, count) {
 360     replacement = this.gsub.prepareReplacement(replacement);
 361     count = Object.isUndefined(count) ? 1 : count;
 362
 363     return this.gsub(pattern, function(match) {
 364       if (--count < 0) return match[0];
 365       return replacement(match);
 366     });
 367   },
 368
 369   scan: function(pattern, iterator) {
 370     this.gsub(pattern, iterator);
 371     return String(this);
 372   },
 373
 374   truncate: function(length, truncation) {
 375     length = length || 30;
 376     truncation = Object.isUndefined(truncation) ? '...' : truncation;
 377     return this.length > length ?
 378       this.slice(0, length - truncation.length) + truncation : String(this);
 379   },
 380
 381   strip: function() {
 382     return this.replace(/^\s+/, '').replace(/\s+$/, '');
 383   },
 384
 385   stripTags: function() {
 386     return this.replace(/<\/?[^>]+>/gi, '');
 387   },
 388
 389   stripScripts: function() {
 390     return this.replace(new RegExp(Prototype.ScriptFragment, 'img'), '');
 391   },
 392
 393   extractScripts: function() {
 394     var matchAll = new RegExp(Prototype.ScriptFragment, 'img');
 395     var matchOne = new RegExp(Prototype.ScriptFragment, 'im');
 396     return (this.match(matchAll) || []).map(function(scriptTag) {
 397       return (scriptTag.match(matchOne) || ['', ''])[1];
 398     });
 399   },
 400
 401   evalScripts: function() {
 402     return this.extractScripts().map(function(script) { return eval(script) });
 403   },
 404
 405   escapeHTML: function() {
 406     var self = arguments.callee;
 407     self.text.data = this;
 408     return self.div.innerHTML;
 409   },
 410
 411   unescapeHTML: function() {
 412     var div = new Element('div');
 413     div.innerHTML = this.stripTags();
 414     return div.childNodes[0] ? (div.childNodes.length > 1 ?
 415       $A(div.childNodes).inject('', function(memo, node) { return memo+node.nodeValue }) :
 416       div.childNodes[0].nodeValue) : '';
 417   },
 418
 419   toQueryParams: function(separator) {
 420     var match = this.strip().match(/([^?#]*)(#.*)?$/);
 421     if (!match) return { };
 422
 423     return match[1].split(separator || '&').inject({ }, function(hash, pair) {
 424       if ((pair = pair.split('='))[0]) {
 425         var key = decodeURIComponent(pair.shift());
 426         var value = pair.length > 1 ? pair.join('=') : pair[0];
 427         if (value != undefined) value = decodeURIComponent(value);
 428
 429         if (key in hash) {
 430           if (!Object.isArray(hash[key])) hash[key] = [hash[key]];
 431           hash[key].push(value);
 432         }
 433         else hash[key] = value;
 434       }
 435       return hash;
 436     });
 437   },
 438
 439   toArray: function() {
 440     return this.split('');
 441   },
 442
 443   succ: function() {
 444     return this.slice(0, this.length - 1) +
 445       String.fromCharCode(this.charCodeAt(this.length - 1) + 1);
 446   },
 447
 448   times: function(count) {
 449     return count < 1 ? '' : new Array(count + 1).join(this);
 450   },
 451
 452   camelize: function() {
 453     var parts = this.split('-'), len = parts.length;
 454     if (len == 1) return parts[0];
 455
 456     var camelized = this.charAt(0) == '-'
 457       ? parts[0].charAt(0).toUpperCase() + parts[0].substring(1)
 458       : parts[0];
 459
 460     for (var i = 1; i < len; i++)
 461       camelized += parts[i].charAt(0).toUpperCase() + parts[i].substring(1);
 462
 463     return camelized;
 464   },
 465
 466   capitalize: function() {
 467     return this.charAt(0).toUpperCase() + this.substring(1).toLowerCase();
 468   },
 469
 470   underscore: function() {
 471     return this.gsub(/::/, '/').gsub(/([A-Z]+)([A-Z][a-z])/,'#{1}_#{2}').gsub(/([a-z\d])([A-Z])/,'#{1}_#{2}').gsub(/-/,'_').toLowerCase();
 472   },
 473
 474   dasherize: function() {
 475     return this.gsub(/_/,'-');
 476   },
 477
 478   inspect: function(useDoubleQuotes) {
 479     var escapedString = this.gsub(/[\x00-\x1f\\]/, function(match) {
 480       var character = String.specialChar[match[0]];
 481       return character ? character : '\\u00' + match[0].charCodeAt().toPaddedString(2, 16);
 482     });
 483     if (useDoubleQuotes) return '"' + escapedString.replace(/"/g, '\\"') + '"';
 484     return "'" + escapedString.replace(/'/g, '\\\'') + "'";
 485   },
 486
 487   toJSON: function() {
 488     return this.inspect(true);
 489   },
 490
 491   unfilterJSON: function(filter) {
 492     return this.sub(filter || Prototype.JSONFilter, '#{1}');
 493   },
 494
 495   isJSON: function() {
 496     var str = this;
 497     if (str.blank()) return false;
 498     str = this.replace(/\\./g, '@').replace(/"[^"\\\n\r]*"/g, '');
 499     return (/^[,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]*$/).test(str);
 500   },
 501
 502   evalJSON: function(sanitize) {
 503     var json = this.unfilterJSON();
 504     try {
 505       if (!sanitize || json.isJSON()) return eval('(' + json + ')');
 506     } catch (e) { }
 507     throw new SyntaxError('Badly formed JSON string: ' + this.inspect());
 508   },
 509
 510   include: function(pattern) {
 511     return this.indexOf(pattern) > -1;
 512   },
 513
 514   startsWith: function(pattern) {
 515     return this.indexOf(pattern) === 0;
 516   },
 517
 518   endsWith: function(pattern) {
 519     var d = this.length - pattern.length;
 520     return d >= 0 && this.lastIndexOf(pattern) === d;
 521   },
 522
 523   empty: function() {
 524     return this == '';
 525   },
 526
 527   blank: function() {
 528     return /^\s*$/.test(this);
 529   },
 530
 531   interpolate: function(object, pattern) {
 532     return new Template(this, pattern).evaluate(object);
 533   }
 534 });
 535
 536 if (Prototype.Browser.WebKit || Prototype.Browser.IE) Object.extend(String.prototype, {
 537   escapeHTML: function() {
 538     return this.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;');
 539   },
 540   unescapeHTML: function() {
 541     return this.stripTags().replace(/&amp;/g,'&').replace(/&lt;/g,'<').replace(/&gt;/g,'>');
 542   }
 543 });
 544
 545 String.prototype.gsub.prepareReplacement = function(replacement) {
 546   if (Object.isFunction(replacement)) return replacement;
 547   var template = new Template(replacement);
 548   return function(match) { return template.evaluate(match) };
 549 };
 550
 551 String.prototype.parseQuery = String.prototype.toQueryParams;
 552
 553 Object.extend(String.prototype.escapeHTML, {
 554   div:  document.createElement('div'),
 555   text: document.createTextNode('')
 556 });
 557
 558 String.prototype.escapeHTML.div.appendChild(String.prototype.escapeHTML.text);
 559
 560 var Template = Class.create({
 561   initialize: function(template, pattern) {
 562     this.template = template.toString();
 563     this.pattern = pattern || Template.Pattern;
 564   },
 565
 566   evaluate: function(object) {
 567     if (Object.isFunction(object.toTemplateReplacements))
 568       object = object.toTemplateReplacements();
 569
 570     return this.template.gsub(this.pattern, function(match) {
 571       if (object == null) return '';
 572
 573       var before = match[1] || '';
 574       if (before == '\\') return match[2];
 575
 576       var ctx = object, expr = match[3];
 577       var pattern = /^([^.[]+|\[((?:.*?[^\\])?)\])(\.|\[|$)/;
 578       match = pattern.exec(expr);
 579       if (match == null) return before;
 580
 581       while (match != null) {
 582         var comp = match[1].startsWith('[') ? match[2].gsub('\\\\]', ']') : match[1];
 583         ctx = ctx[comp];
 584         if (null == ctx || '' == match[3]) break;
 585         expr = expr.substring('[' == match[3] ? match[1].length : match[0].length);
 586         match = pattern.exec(expr);
 587       }
 588
 589       return before + String.interpret(ctx);
 590     });
 591   }
 592 });
 593 Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;
 594
 595 var $break = { };
 596
 597 var Enumerable = {
 598   each: function(iterator, context) {
 599     var index = 0;
 600     try {
 601       this._each(function(value) {
 602         iterator.call(context, value, index++);
 603       });
 604     } catch (e) {
 605       if (e != $break) throw e;
 606     }
 607     return this;
 608   },
 609
 610   eachSlice: function(number, iterator, context) {
 611     var index = -number, slices = [], array = this.toArray();
 612     if (number < 1) return array;
 613     while ((index += number) < array.length)
 614       slices.push(array.slice(index, index+number));
 615     return slices.collect(iterator, context);
 616   },
 617
 618   all: function(iterator, context) {
 619     iterator = iterator || Prototype.K;
 620     var result = true;
 621     this.each(function(value, index) {
 622       result = result && !!iterator.call(context, value, index);
 623       if (!result) throw $break;
 624     });
 625     return result;
 626   },
 627
 628   any: function(iterator, context) {
 629     iterator = iterator || Prototype.K;
 630     var result = false;
 631     this.each(function(value, index) {
 632       if (result = !!iterator.call(context, value, index))
 633         throw $break;
 634     });
 635     return result;
 636   },
 637
 638   collect: function(iterator, context) {
 639     iterator = iterator || Prototype.K;
 640     var results = [];
 641     this.each(function(value, index) {
 642       results.push(iterator.call(context, value, index));
 643     });
 644     return results;
 645   },
 646
 647   detect: function(iterator, context) {
 648     var result;
 649     this.each(function(value, index) {
 650       if (iterator.call(context, value, index)) {
 651         result = value;
 652         throw $break;
 653       }
 654     });
 655     return result;
 656   },
 657
 658   findAll: function(iterator, context) {
 659     var results = [];
 660     this.each(function(value, index) {
 661       if (iterator.call(context, value, index))
 662         results.push(value);
 663     });
 664     return results;
 665   },
 666
 667   grep: function(filter, iterator, context) {
 668     iterator = iterator || Prototype.K;
 669     var results = [];
 670
 671     if (Object.isString(filter))
 672       filter = new RegExp(filter);
 673
 674     this.each(function(value, index) {
 675       if (filter.match(value))
 676         results.push(iterator.call(context, value, index));
 677     });
 678     return results;
 679   },
 680
 681   include: function(object) {
 682     if (Object.isFunction(this.indexOf))
 683       if (this.indexOf(object) != -1) return true;
 684
 685     var found = false;
 686     this.each(function(value) {
 687       if (value == object) {
 688         found = true;
 689         throw $break;
 690       }
 691     });
 692     return found;
 693   },
 694
 695   inGroupsOf: function(number, fillWith) {
 696     fillWith = Object.isUndefined(fillWith) ? null : fillWith;
 697     return this.eachSlice(number, function(slice) {
 698       while(slice.length < number) slice.push(fillWith);
 699       return slice;
 700     });
 701   },
 702
 703   inject: function(memo, iterator, context) {
 704     this.each(function(value, index) {
 705       memo = iterator.call(context, memo, value, index);
 706     });
 707     return memo;
 708   },
 709
 710   invoke: function(method) {
 711     var args = $A(arguments).slice(1);
 712     return this.map(function(value) {
 713       return value[method].apply(value, args);
 714     });
 715   },
 716
 717   max: function(iterator, context) {
 718     iterator = iterator || Prototype.K;
 719     var result;
 720     this.each(function(value, index) {
 721       value = iterator.call(context, value, index);
 722       if (result == null || value >= result)
 723         result = value;
 724     });
 725     return result;
 726   },
 727
 728   min: function(iterator, context) {
 729     iterator = iterator || Prototype.K;
 730     var result;
 731     this.each(function(value, index) {
 732       value = iterator.call(context, value, index);
 733       if (result == null || value < result)
 734         result = value;
 735     });
 736     return result;
 737   },
 738
 739   partition: function(iterator, context) {
 740     iterator = iterator || Prototype.K;
 741     var trues = [], falses = [];
 742     this.each(function(value, index) {
 743       (iterator.call(context, value, index) ?
 744         trues : falses).push(value);
 745     });
 746     return [trues, falses];
 747   },
 748
 749   pluck: function(property) {
 750     var results = [];
 751     this.each(function(value) {
 752       results.push(value[property]);
 753     });
 754     return results;
 755   },
 756
 757   reject: function(iterator, context) {
 758     var results = [];
 759     this.each(function(value, index) {
 760       if (!iterator.call(context, value, index))
 761         results.push(value);
 762     });
 763     return results;
 764   },
 765
 766   sortBy: function(iterator, context) {
 767     return this.map(function(value, index) {
 768       return {
 769         value: value,
 770         criteria: iterator.call(context, value, index)
 771       };
 772     }).sort(function(left, right) {
 773       var a = left.criteria, b = right.criteria;
 774       return a < b ? -1 : a > b ? 1 : 0;
 775     }).pluck('value');
 776   },
 777
 778   toArray: function() {
 779     return this.map();
 780   },
 781
 782   zip: function() {
 783     var iterator = Prototype.K, args = $A(arguments);
 784     if (Object.isFunction(args.last()))
 785       iterator = args.pop();
 786
 787     var collections = [this].concat(args).map($A);
 788     return this.map(function(value, index) {
 789       return iterator(collections.pluck(index));
 790     });
 791   },
 792
 793   size: function() {
 794     return this.toArray().length;
 795   },
 796
 797   inspect: function() {
 798     return '#<Enumerable:' + this.toArray().inspect() + '>';
 799   }
 800 };
 801
 802 Object.extend(Enumerable, {
 803   map:     Enumerable.collect,
 804   find:    Enumerable.detect,
 805   select:  Enumerable.findAll,
 806   filter:  Enumerable.findAll,
 807   member:  Enumerable.include,
 808   entries: Enumerable.toArray,
 809   every:   Enumerable.all,
 810   some:    Enumerable.any
 811 });
 812 function $A(iterable) {
 813   if (!iterable) return [];
 814   if (iterable.toArray) return iterable.toArray();
 815   var length = iterable.length || 0, results = new Array(length);
 816   while (length--) results[length] = iterable[length];
 817   return results;
 818 }
 819
 820 if (Prototype.Browser.WebKit) {
 821   $A = function(iterable) {
 822     if (!iterable) return [];
 823     // In Safari, only use the `toArray` method if it's not a NodeList.
 824     // A NodeList is a function, has an function `item` property, and a numeric
 825     // `length` property. Adapted from Google Doctype.
 826     if (!(typeof iterable === 'function' && typeof iterable.length ===
 827         'number' && typeof iterable.item === 'function') && iterable.toArray)
 828       return iterable.toArray();
 829     var length = iterable.length || 0, results = new Array(length);
 830     while (length--) results[length] = iterable[length];
 831     return results;
 832   };
 833 }
 834
 835 Array.from = $A;
 836
 837 Object.extend(Array.prototype, Enumerable);
 838
 839 if (!Array.prototype._reverse) Array.prototype._reverse = Array.prototype.reverse;
 840
 841 Object.extend(Array.prototype, {
 842   _each: function(iterator) {
 843     for (var i = 0, length = this.length; i < length; i++)
 844       iterator(this[i]);
 845   },
 846
 847   clear: function() {
 848     this.length = 0;
 849     return this;
 850   },
 851
 852   first: function() {
 853     return this[0];
 854   },
 855
 856   last: function() {
 857     return this[this.length - 1];
 858   },
 859
 860   compact: function() {
 861     return this.select(function(value) {
 862       return value != null;
 863     });
 864   },
 865
 866   flatten: function() {
 867     return this.inject([], function(array, value) {
 868       return array.concat(Object.isArray(value) ?
 869         value.flatten() : [value]);
 870     });
 871   },
 872
 873   without: function() {
 874     var values = $A(arguments);
 875     return this.select(function(value) {
 876       return !values.include(value);
 877     });
 878   },
 879
 880   reverse: function(inline) {
 881     return (inline !== false ? this : this.toArray())._reverse();
 882   },
 883
 884   reduce: function() {
 885     return this.length > 1 ? this : this[0];
 886   },
 887
 888   uniq: function(sorted) {
 889     return this.inject([], function(array, value, index) {
 890       if (0 == index || (sorted ? array.last() != value : !array.include(value)))
 891         array.push(value);
 892       return array;
 893     });
 894   },
 895
 896   intersect: function(array) {
 897     return this.uniq().findAll(function(item) {
 898       return array.detect(function(value) { return item === value });
 899     });
 900   },
 901
 902   clone: function() {
 903     return [].concat(this);
 904   },
 905
 906   size: function() {
 907     return this.length;
 908   },
 909
 910   inspect: function() {
 911     return '[' + this.map(Object.inspect).join(', ') + ']';
 912   },
 913
 914   toJSON: function() {
 915     var results = [];
 916     this.each(function(object) {
 917       var value = Object.toJSON(object);
 918       if (!Object.isUndefined(value)) results.push(value);
 919     });
 920     return '[' + results.join(', ') + ']';
 921   }
 922 });
 923
 924 // use native browser JS 1.6 implementation if available
 925 if (Object.isFunction(Array.prototype.forEach))
 926   Array.prototype._each = Array.prototype.forEach;
 927
 928 if (!Array.prototype.indexOf) Array.prototype.indexOf = function(item, i) {
 929   i || (i = 0);
 930   var length = this.length;
 931   if (i < 0) i = length + i;
 932   for (; i < length; i++)
 933     if (this[i] === item) return i;
 934   return -1;
 935 };
 936
 937 if (!Array.prototype.lastIndexOf) Array.prototype.lastIndexOf = function(item, i) {
 938   i = isNaN(i) ? this.length : (i < 0 ? this.length + i : i) + 1;
 939   var n = this.slice(0, i).reverse().indexOf(item);
 940   return (n < 0) ? n : i - n - 1;
 941 };
 942
 943 Array.prototype.toArray = Array.prototype.clone;
 944
 945 function $w(string) {
 946   if (!Object.isString(string)) return [];
 947   string = string.strip();
 948   return string ? string.split(/\s+/) : [];
 949 }
 950
 951 if (Prototype.Browser.Opera){
 952   Array.prototype.concat = function() {
 953     var array = [];
 954     for (var i = 0, length = this.length; i < length; i++) array.push(this[i]);
 955     for (var i = 0, length = arguments.length; i < length; i++) {
 956       if (Object.isArray(arguments[i])) {
 957         for (var j = 0, arrayLength = arguments[i].length; j < arrayLength; j++)
 958           array.push(arguments[i][j]);
 959       } else {
 960         array.push(arguments[i]);
 961       }
 962     }
 963     return array;
 964   };
 965 }
 966 Object.extend(Number.prototype, {
 967   toColorPart: function() {
 968     return this.toPaddedString(2, 16);
 969   },
 970
 971   succ: function() {
 972     return this + 1;
 973   },
 974
 975   times: function(iterator, context) {
 976     $R(0, this, true).each(iterator, context);
 977     return this;
 978   },
 979
 980   toPaddedString: function(length, radix) {
 981     var string = this.toString(radix || 10);
 982     return '0'.times(length - string.length) + string;
 983   },
 984
 985   toJSON: function() {
 986     return isFinite(this) ? this.toString() : 'null';
 987   }
 988 });
 989
 990 $w('abs round ceil floor').each(function(method){
 991   Number.prototype[method] = Math[method].methodize();
 992 });
 993 function $H(object) {
 994   return new Hash(object);
 995 };
 996
 997 var Hash = Class.create(Enumerable, (function() {
 998
 999   function toQueryPair(key, value) {
1000     if (Object.isUndefined(value)) return key;
1001     return key + '=' + encodeURIComponent(String.interpret(value));
1002   }
1003
1004   return {
1005     initialize: function(object) {
1006       this._object = Object.isHash(object) ? object.toObject() : Object.clone(object);
1007     },
1008
1009     _each: function(iterator) {
1010       for (var key in this._object) {
1011         var value = this._object[key], pair = [key, value];
1012         pair.key = key;
1013         pair.value = value;
1014         iterator(pair);
1015       }
1016     },
1017
1018     set: function(key, value) {
1019       return this._object[key] = value;
1020     },
1021
1022     get: function(key) {
1023       // simulating poorly supported hasOwnProperty
1024       if (this._object[key] !== Object.prototype[key])
1025         return this._object[key];
1026     },
1027
1028     unset: function(key) {
1029       var value = this._object[key];
1030       delete this._object[key];
1031       return value;
1032     },
1033
1034     toObject: function() {
1035       return Object.clone(this._object);
1036     },
1037
1038     keys: function() {
1039       return this.pluck('key');
1040     },
1041
1042     values: function() {
1043       return this.pluck('value');
1044     },
1045
1046     index: function(value) {
1047       var match = this.detect(function(pair) {
1048         return pair.value === value;
1049       });
1050       return match && match.key;
1051     },
1052
1053     merge: function(object) {
1054       return this.clone().update(object);
1055     },
1056
1057     update: function(object) {
1058       return new Hash(object).inject(this, function(result, pair) {
1059         result.set(pair.key, pair.value);
1060         return result;
1061       });
1062     },
1063
1064     toQueryString: function() {
1065       return this.inject([], function(results, pair) {
1066         var key = encodeURIComponent(pair.key), values = pair.value;
1067
1068         if (values && typeof values == 'object') {
1069           if (Object.isArray(values))
1070             return results.concat(values.map(toQueryPair.curry(key)));
1071         } else results.push(toQueryPair(key, values));
1072         return results;
1073       }).join('&');
1074     },
1075
1076     inspect: function() {
1077       return '#<Hash:{' + this.map(function(pair) {
1078         return pair.map(Object.inspect).join(': ');
1079       }).join(', ') + '}>';
1080     },
1081
1082     toJSON: function() {
1083       return Object.toJSON(this.toObject());
1084     },
1085
1086     clone: function() {
1087       return new Hash(this);
1088     }
1089   }
1090 })());
1091
1092 Hash.prototype.toTemplateReplacements = Hash.prototype.toObject;
1093 Hash.from = $H;
1094 var ObjectRange = Class.create(Enumerable, {
1095   initialize: function(start, end, exclusive) {
1096     this.start = start;
1097     this.end = end;
1098     this.exclusive = exclusive;
1099   },
1100
1101   _each: function(iterator) {
1102     var value = this.start;
1103     while (this.include(value)) {
1104       iterator(value);
1105       value = value.succ();
1106     }
1107   },
1108
1109   include: function(value) {
1110     if (value < this.start)
1111       return false;
1112     if (this.exclusive)
1113       return value < this.end;
1114     return value <= this.end;
1115   }
1116 });
1117
1118 var $R = function(start, end, exclusive) {
1119   return new ObjectRange(start, end, exclusive);
1120 };
1121
1122 var Ajax = {
1123   getTransport: function() {
1124     return Try.these(
1125       function() {return new XMLHttpRequest()},
1126       function() {return new ActiveXObject('Msxml2.XMLHTTP')},
1127       function() {return new ActiveXObject('Microsoft.XMLHTTP')}
1128     ) || false;
1129   },
1130
1131   activeRequestCount: 0
1132 };
1133
1134 Ajax.Responders = {
1135   responders: [],
1136
1137   _each: function(iterator) {
1138     this.responders._each(iterator);
1139   },
1140
1141   register: function(responder) {
1142     if (!this.include(responder))
1143       this.responders.push(responder);
1144   },
1145
1146   unregister: function(responder) {
1147     this.responders = this.responders.without(responder);
1148   },
1149
1150   dispatch: function(callback, request, transport, json) {
1151     this.each(function(responder) {
1152       if (Object.isFunction(responder[callback])) {
1153         try {
1154           responder[callback].apply(responder, [request, transport, json]);
1155         } catch (e) { }
1156       }
1157     });
1158   }
1159 };
1160
1161 Object.extend(Ajax.Responders, Enumerable);
1162
1163 Ajax.Responders.register({
1164   onCreate:   function() { Ajax.activeRequestCount++ },
1165   onComplete: function() { Ajax.activeRequestCount-- }
1166 });
1167
1168 Ajax.Base = Class.create({
1169   initialize: function(options) {
1170     this.options = {
1171       method:       'post',
1172       asynchronous: true,
1173       contentType:  'application/x-www-form-urlencoded',
1174       encoding:     'UTF-8',
1175       parameters:   '',
1176       evalJSON:     true,
1177       evalJS:       true
1178     };
1179     Object.extend(this.options, options || { });
1180
1181     this.options.method = this.options.method.toLowerCase();
1182
1183     if (Object.isString(this.options.parameters))
1184       this.options.parameters = this.options.parameters.toQueryParams();
1185     else if (Object.isHash(this.options.parameters))
1186       this.options.parameters = this.options.parameters.toObject();
1187   }
1188 });
1189
1190 Ajax.Request = Class.create(Ajax.Base, {
1191   _complete: false,
1192
1193   initialize: function($super, url, options) {
1194     $super(options);
1195     this.transport = Ajax.getTransport();
1196     this.request(url);
1197   },
1198
1199   request: function(url) {
1200     this.url = url;
1201     this.method = this.options.method;
1202     var params = Object.clone(this.options.parameters);
1203
1204     if (!['get', 'post'].include(this.method)) {
1205       // simulate other verbs over post
1206       params['_method'] = this.method;
1207       this.method = 'post';
1208     }
1209
1210     this.parameters = params;
1211
1212     if (params = Object.toQueryString(params)) {
1213       // when GET, append parameters to URL
1214       if (this.method == 'get')
1215         this.url += (this.url.include('?') ? '&' : '?') + params;
1216       else if (/Konqueror|Safari|KHTML/.test(navigator.userAgent))
1217         params += '&_=';
1218     }
1219
1220     try {
1221       var response = new Ajax.Response(this);
1222       if (this.options.onCreate) this.options.onCreate(response);
1223       Ajax.Responders.dispatch('onCreate', this, response);
1224
1225       this.transport.open(this.method.toUpperCase(), this.url,
1226         this.options.asynchronous);
1227
1228       if (this.options.asynchronous) this.respondToReadyState.bind(this).defer(1);
1229
1230       this.transport.onreadystatechange = this.onStateChange.bind(this);
1231       this.setRequestHeaders();
1232
1233       this.body = this.method == 'post' ? (this.options.postBody || params) : null;
1234       this.transport.send(this.body);
1235
1236       /* Force Firefox to handle ready state 4 for synchronous requests */
1237       if (!this.options.asynchronous && this.transport.overrideMimeType)
1238         this.onStateChange();
1239
1240     }
1241     catch (e) {
1242       this.dispatchException(e);
1243     }
1244   },
1245
1246   onStateChange: function() {
1247     var readyState = this.transport.readyState;
1248     if (readyState > 1 && !((readyState == 4) && this._complete))
1249       this.respondToReadyState(this.transport.readyState);
1250   },
1251
1252   setRequestHeaders: function() {
1253     var headers = {
1254       'X-Requested-With': 'XMLHttpRequest',
1255       'X-Prototype-Version': Prototype.Version,
1256       'Accept': 'text/javascript, text/html, application/xml, text/xml, */*'
1257     };
1258
1259     if (this.method == 'post') {
1260       headers['Content-type'] = this.options.contentType +
1261         (this.options.encoding ? '; charset=' + this.options.encoding : '');
1262
1263       /* Force "Connection: close" for older Mozilla browsers to work
1264        * around a bug where XMLHttpRequest sends an incorrect
1265        * Content-length header. See Mozilla Bugzilla #246651.
1266        */
1267       if (this.transport.overrideMimeType &&
1268           (navigator.userAgent.match(/Gecko\/(\d{4})/) || [0,2005])[1] < 2005)
1269             headers['Connection'] = 'close';
1270     }
1271
1272     // user-defined headers
1273     if (typeof this.options.requestHeaders == 'object') {
1274       var extras = this.options.requestHeaders;
1275
1276       if (Object.isFunction(extras.push))
1277         for (var i = 0, length = extras.length; i < length; i += 2)
1278           headers[extras[i]] = extras[i+1];
1279       else
1280         $H(extras).each(function(pair) { headers[pair.key] = pair.value });
1281     }
1282
1283     for (var name in headers)
1284       this.transport.setRequestHeader(name, headers[name]);
1285   },
1286
1287   success: function() {
1288     var status = this.getStatus();
1289     return !status || (status >= 200 && status < 300);
1290   },
1291
1292   getStatus: function() {
1293     try {
1294       return this.transport.status || 0;
1295     } catch (e) { return 0 }
1296   },
1297
1298   respondToReadyState: function(readyState) {
1299     var state = Ajax.Request.Events[readyState], response = new Ajax.Response(this);
1300
1301     if (state == 'Complete') {
1302       try {
1303         this._complete = true;
1304         (this.options['on' + response.status]
1305          || this.options['on' + (this.success() ? 'Success' : 'Failure')]
1306          || Prototype.emptyFunction)(response, response.headerJSON);
1307       } catch (e) {
1308         this.dispatchException(e);
1309       }
1310
1311       var contentType = response.getHeader('Content-type');
1312       if (this.options.evalJS == 'force'
1313           || (this.options.evalJS && this.isSameOrigin() && contentType
1314           && contentType.match(/^\s*(text|application)\/(x-)?(java|ecma)script(;.*)?\s*$/i)))
1315         this.evalResponse();
1316     }
1317
1318     try {
1319       (this.options['on' + state] || Prototype.emptyFunction)(response, response.headerJSON);
1320       Ajax.Responders.dispatch('on' + state, this, response, response.headerJSON);
1321     } catch (e) {
1322       this.dispatchException(e);
1323     }
1324
1325     if (state == 'Complete') {
1326       // avoid memory leak in MSIE: clean up
1327       this.transport.onreadystatechange = Prototype.emptyFunction;
1328     }
1329   },
1330
1331   isSameOrigin: function() {
1332     var m = this.url.match(/^\s*https?:\/\/[^\/]*/);
1333     return !m || (m[0] == '#{protocol}//#{domain}#{port}'.interpolate({
1334       protocol: location.protocol,
1335       domain: document.domain,
1336       port: location.port ? ':' + location.port : ''
1337     }));
1338   },
1339
1340   getHeader: function(name) {
1341     try {
1342       return this.transport.getResponseHeader(name) || null;
1343     } catch (e) { return null }
1344   },
1345
1346   evalResponse: function() {
1347     try {
1348       return eval((this.transport.responseText || '').unfilterJSON());
1349     } catch (e) {
1350       this.dispatchException(e);
1351     }
1352   },
1353
1354   dispatchException: function(exception) {
1355     (this.options.onException || Prototype.emptyFunction)(this, exception);
1356     Ajax.Responders.dispatch('onException', this, exception);
1357   }
1358 });
1359
1360 Ajax.Request.Events =
1361   ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];
1362
1363 Ajax.Response = Class.create({
1364   initialize: function(request){
1365     this.request = request;
1366     var transport  = this.transport  = request.transport,
1367         readyState = this.readyState = transport.readyState;
1368
1369     if((readyState > 2 && !Prototype.Browser.IE) || readyState == 4) {
1370       this.status       = this.getStatus();
1371       this.statusText   = this.getStatusText();
1372       this.responseText = String.interpret(transport.responseText);
1373       this.headerJSON   = this._getHeaderJSON();
1374     }
1375
1376     if(readyState == 4) {
1377       var xml = transport.responseXML;
1378       this.responseXML  = Object.isUndefined(xml) ? null : xml;
1379       this.responseJSON = this._getResponseJSON();
1380     }
1381   },
1382
1383   status:      0,
1384   statusText: '',
1385
1386   getStatus: Ajax.Request.prototype.getStatus,
1387
1388   getStatusText: function() {
1389     try {
1390       return this.transport.statusText || '';
1391     } catch (e) { return '' }
1392   },
1393
1394   getHeader: Ajax.Request.prototype.getHeader,
1395
1396   getAllHeaders: function() {
1397     try {
1398       return this.getAllResponseHeaders();
1399     } catch (e) { return null }
1400   },
1401
1402   getResponseHeader: function(name) {
1403     return this.transport.getResponseHeader(name);
1404   },
1405
1406   getAllResponseHeaders: function() {
1407     return this.transport.getAllResponseHeaders();
1408   },
1409
1410   _getHeaderJSON: function() {
1411     var json = this.getHeader('X-JSON');
1412     if (!json) return null;
1413     json = decodeURIComponent(escape(json));
1414     try {
1415       return json.evalJSON(this.request.options.sanitizeJSON ||
1416         !this.request.isSameOrigin());
1417     } catch (e) {
1418       this.request.dispatchException(e);
1419     }
1420   },
1421
1422   _getResponseJSON: function() {
1423     var options = this.request.options;
1424     if (!options.evalJSON || (options.evalJSON != 'force' &&
1425       !(this.getHeader('Content-type') || '').include('application/json')) ||
1426         this.responseText.blank())
1427           return null;
1428     try {
1429       return this.responseText.evalJSON(options.sanitizeJSON ||
1430         !this.request.isSameOrigin());
1431     } catch (e) {
1432       this.request.dispatchException(e);
1433     }
1434   }
1435 });
1436
1437 Ajax.Updater = Class.create(Ajax.Request, {
1438   initialize: function($super, container, url, options) {
1439     this.container = {
1440       success: (container.success || container),
1441       failure: (container.failure || (container.success ? null : container))
1442     };
1443
1444     options = Object.clone(options);
1445     var onComplete = options.onComplete;
1446     options.onComplete = (function(response, json) {
1447       this.updateContent(response.responseText);
1448       if (Object.isFunction(onComplete)) onComplete(response, json);
1449     }).bind(this);
1450
1451     $super(url, options);
1452   },
1453
1454   updateContent: function(responseText) {
1455     var receiver = this.container[this.success() ? 'success' : 'failure'],
1456         options = this.options;
1457
1458     if (!options.evalScripts) responseText = responseText.stripScripts();
1459
1460     if (receiver = $(receiver)) {
1461       if (options.insertion) {
1462         if (Object.isString(options.insertion)) {
1463           var insertion = { }; insertion[options.insertion] = responseText;
1464           receiver.insert(insertion);
1465         }
1466         else options.insertion(receiver, responseText);
1467       }
1468       else receiver.update(responseText);
1469     }
1470   }
1471 });
1472
1473 Ajax.PeriodicalUpdater = Class.create(Ajax.Base, {
1474   initialize: function($super, container, url, options) {
1475     $super(options);
1476     this.onComplete = this.options.onComplete;
1477
1478     this.frequency = (this.options.frequency || 2);
1479     this.decay = (this.options.decay || 1);
1480
1481     this.updater = { };
1482     this.container = container;
1483     this.url = url;
1484
1485     this.start();
1486   },
1487
1488   start: function() {
1489     this.options.onComplete = this.updateComplete.bind(this);
1490     this.onTimerEvent();
1491   },
1492
1493   stop: function() {
1494     this.updater.options.onComplete = undefined;
1495     clearTimeout(this.timer);
1496     (this.onComplete || Prototype.emptyFunction).apply(this, arguments);
1497   },
1498
1499   updateComplete: function(response) {
1500     if (this.options.decay) {
1501       this.decay = (response.responseText == this.lastText ?
1502         this.decay * this.options.decay : 1);
1503
1504       this.lastText = response.responseText;
1505     }
1506     this.timer = this.onTimerEvent.bind(this).delay(this.decay * this.frequency);
1507   },
1508
1509   onTimerEvent: function() {
1510     this.updater = new Ajax.Updater(this.container, this.url, this.options);
1511   }
1512 });
1513 function $(element) {
1514   if (arguments.length > 1) {
1515     for (var i = 0, elements = [], length = arguments.length; i < length; i++)
1516       elements.push($(arguments[i]));
1517     return elements;
1518   }
1519   if (Object.isString(element))
1520     element = document.getElementById(element);
1521   return Element.extend(element);
1522 }
1523
1524 if (Prototype.BrowserFeatures.XPath) {
1525   document._getElementsByXPath = function(expression, parentElement) {
1526     var results = [];
1527     var query = document.evaluate(expression, $(parentElement) || document,
1528       null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
1529     for (var i = 0, length = query.snapshotLength; i < length; i++)
1530       results.push(Element.extend(query.snapshotItem(i)));
1531     return results;
1532   };
1533 }
1534
1535 /*--------------------------------------------------------------------------*/
1536
1537 if (!window.Node) var Node = { };
1538
1539 if (!Node.ELEMENT_NODE) {
1540   // DOM level 2 ECMAScript Language Binding
1541   Object.extend(Node, {
1542     ELEMENT_NODE: 1,
1543     ATTRIBUTE_NODE: 2,
1544     TEXT_NODE: 3,
1545     CDATA_SECTION_NODE: 4,
1546     ENTITY_REFERENCE_NODE: 5,
1547     ENTITY_NODE: 6,
1548     PROCESSING_INSTRUCTION_NODE: 7,
1549     COMMENT_NODE: 8,
1550     DOCUMENT_NODE: 9,
1551     DOCUMENT_TYPE_NODE: 10,
1552     DOCUMENT_FRAGMENT_NODE: 11,
1553     NOTATION_NODE: 12
1554   });
1555 }
1556
1557 (function() {
1558   var element = this.Element;
1559   this.Element = function(tagName, attributes) {
1560     attributes = attributes || { };
1561     tagName = tagName.toLowerCase();
1562     var cache = Element.cache;
1563     if (Prototype.Browser.IE && attributes.name) {
1564       tagName = '<' + tagName + ' name="' + attributes.name + '">';
1565       delete attributes.name;
1566       return Element.writeAttribute(document.createElement(tagName), attributes);
1567     }
1568     if (!cache[tagName]) cache[tagName] = Element.extend(document.createElement(tagName));
1569     return Element.writeAttribute(cache[tagName].cloneNode(false), attributes);
1570   };
1571   Object.extend(this.Element, element || { });
1572   if (element) this.Element.prototype = element.prototype;
1573 }).call(window);
1574
1575 Element.cache = { };
1576
1577 Element.Methods = {
1578   visible: function(element) {
1579     return $(element).style.display != 'none';
1580   },
1581
1582   toggle: function(element) {
1583     element = $(element);
1584     Element[Element.visible(element) ? 'hide' : 'show'](element);
1585     return element;
1586   },
1587
1588   hide: function(element) {
1589     element = $(element);
1590     element.style.display = 'none';
1591     return element;
1592   },
1593
1594   show: function(element) {
1595     element = $(element);
1596     element.style.display = '';
1597     return element;
1598   },
1599
1600   remove: function(element) {
1601     element = $(element);
1602     element.parentNode.removeChild(element);
1603     return element;
1604   },
1605
1606   update: function(element, content) {
1607     element = $(element);
1608     if (content && content.toElement) content = content.toElement();
1609     if (Object.isElement(content)) return element.update().insert(content);
1610     content = Object.toHTML(content);
1611     element.innerHTML = content.stripScripts();
1612     content.evalScripts.bind(content).defer();
1613     return element;
1614   },
1615
1616   replace: function(element, content) {
1617     element = $(element);
1618     if (content && content.toElement) content = content.toElement();
1619     else if (!Object.isElement(content)) {
1620       content = Object.toHTML(content);
1621       var range = element.ownerDocument.createRange();
1622       range.selectNode(element);
1623       content.evalScripts.bind(content).defer();
1624       content = range.createContextualFragment(content.stripScripts());
1625     }
1626     element.parentNode.replaceChild(content, element);
1627     return element;
1628   },
1629
1630   insert: function(element, insertions) {
1631     element = $(element);
1632
1633     if (Object.isString(insertions) || Object.isNumber(insertions) ||
1634         Object.isElement(insertions) || (insertions && (insertions.toElement || insertions.toHTML)))
1635           insertions = {bottom:insertions};
1636
1637     var content, insert, tagName, childNodes;
1638
1639     for (var position in insertions) {
1640       content  = insertions[position];
1641       position = position.toLowerCase();
1642       insert = Element._insertionTranslations[position];
1643
1644       if (content && content.toElement) content = content.toElement();
1645       if (Object.isElement(content)) {
1646         insert(element, content);
1647         continue;
1648       }
1649
1650       content = Object.toHTML(content);
1651
1652       tagName = ((position == 'before' || position == 'after')
1653         ? element.parentNode : element).tagName.toUpperCase();
1654
1655       childNodes = Element._getContentFromAnonymousElement(tagName, content.stripScripts());
1656
1657       if (position == 'top' || position == 'after') childNodes.reverse();
1658       childNodes.each(insert.curry(element));
1659
1660       content.evalScripts.bind(content).defer();
1661     }
1662
1663     return element;
1664   },
1665
1666   wrap: function(element, wrapper, attributes) {
1667     element = $(element);
1668     if (Object.isElement(wrapper))
1669       $(wrapper).writeAttribute(attributes || { });
1670     else if (Object.isString(wrapper)) wrapper = new Element(wrapper, attributes);
1671     else wrapper = new Element('div', wrapper);
1672     if (element.parentNode)
1673       element.parentNode.replaceChild(wrapper, element);
1674     wrapper.appendChild(element);
1675     return wrapper;
1676   },
1677
1678   inspect: function(element) {
1679     element = $(element);
1680     var result = '<' + element.tagName.toLowerCase();
1681     $H({'id': 'id', 'className': 'class'}).each(function(pair) {
1682       var property = pair.first(), attribute = pair.last();
1683       var value = (element[property] || '').toString();
1684       if (value) result += ' ' + attribute + '=' + value.inspect(true);
1685     });
1686     return result + '>';
1687   },
1688
1689   recursivelyCollect: function(element, property) {
1690     element = $(element);
1691     var elements = [];
1692     while (element = element[property])
1693       if (element.nodeType == 1)
1694         elements.push(Element.extend(element));
1695     return elements;
1696   },
1697
1698   ancestors: function(element) {
1699     return $(element).recursivelyCollect('parentNode');
1700   },
1701
1702   descendants: function(element) {
1703     return $(element).select("*");
1704   },
1705
1706   firstDescendant: function(element) {
1707     element = $(element).firstChild;
1708     while (element && element.nodeType != 1) element = element.nextSibling;
1709     return $(element);
1710   },
1711
1712   immediateDescendants: function(element) {
1713     if (!(element = $(element).firstChild)) return [];
1714     while (element && element.nodeType != 1) element = element.nextSibling;
1715     if (element) return [element].concat($(element).nextSiblings());
1716     return [];
1717   },
1718
1719   previousSiblings: function(element) {
1720     return $(element).recursivelyCollect('previousSibling');
1721   },
1722
1723   nextSiblings: function(element) {
1724     return $(element).recursivelyCollect('nextSibling');
1725   },
1726
1727   siblings: function(element) {
1728     element = $(element);
1729     return element.previousSiblings().reverse().concat(element.nextSiblings());
1730   },
1731
1732   match: function(element, selector) {
1733     if (Object.isString(selector))
1734       selector = new Selector(selector);
1735     return selector.match($(element));
1736   },
1737
1738   up: function(element, expression, index) {
1739     element = $(element);
1740     if (arguments.length == 1) return $(element.parentNode);
1741     var ancestors = element.ancestors();
1742     return Object.isNumber(expression) ? ancestors[expression] :
1743       Selector.findElement(ancestors, expression, index);
1744   },
1745
1746   down: function(element, expression, index) {
1747     element = $(element);
1748     if (arguments.length == 1) return element.firstDescendant();
1749     return Object.isNumber(expression) ? element.descendants()[expression] :
1750       Element.select(element, expression)[index || 0];
1751   },
1752
1753   previous: function(element, expression, index) {
1754     element = $(element);
1755     if (arguments.length == 1) return $(Selector.handlers.previousElementSibling(element));
1756     var previousSiblings = element.previousSiblings();
1757     return Object.isNumber(expression) ? previousSiblings[expression] :
1758       Selector.findElement(previousSiblings, expression, index);
1759   },
1760
1761   next: function(element, expression, index) {
1762     element = $(element);
1763     if (arguments.length == 1) return $(Selector.handlers.nextElementSibling(element));
1764     var nextSiblings = element.nextSiblings();
1765     return Object.isNumber(expression) ? nextSiblings[expression] :
1766       Selector.findElement(nextSiblings, expression, index);
1767   },
1768
1769   select: function() {
1770     var args = $A(arguments), element = $(args.shift());
1771     return Selector.findChildElements(element, args);
1772   },
1773
1774   adjacent: function() {
1775     var args = $A(arguments), element = $(args.shift());
1776     return Selector.findChildElements(element.parentNode, args).without(element);
1777   },
1778
1779   identify: function(element) {
1780     element = $(element);
1781     var id = element.readAttribute('id'), self = arguments.callee;
1782     if (id) return id;
1783     do { id = 'anonymous_element_' + self.counter++ } while ($(id));
1784     element.writeAttribute('id', id);
1785     return id;
1786   },
1787
1788   readAttribute: function(element, name) {
1789     element = $(element);
1790     if (Prototype.Browser.IE) {
1791       var t = Element._attributeTranslations.read;
1792       if (t.values[name]) return t.values[name](element, name);
1793       if (t.names[name]) name = t.names[name];
1794       if (name.include(':')) {
1795         return (!element.attributes || !element.attributes[name]) ? null :
1796          element.attributes[name].value;
1797       }
1798     }
1799     return element.getAttribute(name);
1800   },
1801
1802   writeAttribute: function(element, name, value) {
1803     element = $(element);
1804     var attributes = { }, t = Element._attributeTranslations.write;
1805
1806     if (typeof name == 'object') attributes = name;
1807     else attributes[name] = Object.isUndefined(value) ? true : value;
1808
1809     for (var attr in attributes) {
1810       name = t.names[attr] || attr;
1811       value = attributes[attr];
1812       if (t.values[attr]) name = t.values[attr](element, value);
1813       if (value === false || value === null)
1814         element.removeAttribute(name);
1815       else if (value === true)
1816         element.setAttribute(name, name);
1817       else element.setAttribute(name, value);
1818     }
1819     return element;
1820   },
1821
1822   getHeight: function(element) {
1823     return $(element).getDimensions().height;
1824   },
1825
1826   getWidth: function(element) {
1827     return $(element).getDimensions().width;
1828   },
1829
1830   classNames: function(element) {
1831     return new Element.ClassNames(element);
1832   },
1833
1834   hasClassName: function(element, className) {
1835     if (!(element = $(element))) return;
1836     var elementClassName = element.className;
1837     return (elementClassName.length > 0 && (elementClassName == className ||
1838       new RegExp("(^|\\s)" + className + "(\\s|$)").test(elementClassName)));
1839   },
1840
1841   addClassName: function(element, className) {
1842     if (!(element = $(element))) return;
1843     if (!element.hasClassName(className))
1844       element.className += (element.className ? ' ' : '') + className;
1845     return element;
1846   },
1847
1848   removeClassName: function(element, className) {
1849     if (!(element = $(element))) return;
1850     element.className = element.className.replace(
1851       new RegExp("(^|\\s+)" + className + "(\\s+|$)"), ' ').strip();
1852     return element;
1853   },
1854
1855   toggleClassName: function(element, className) {
1856     if (!(element = $(element))) return;
1857     return element[element.hasClassName(className) ?
1858       'removeClassName' : 'addClassName'](className);
1859   },
1860
1861   // removes whitespace-only text node children
1862   cleanWhitespace: function(element) {
1863     element = $(element);
1864     var node = element.firstChild;
1865     while (node) {
1866       var nextNode = node.nextSibling;
1867       if (node.nodeType == 3 && !/\S/.test(node.nodeValue))
1868         element.removeChild(node);
1869       node = nextNode;
1870     }
1871     return element;
1872   },
1873
1874   empty: function(element) {
1875     return $(element).innerHTML.blank();
1876   },
1877
1878   descendantOf: function(element, ancestor) {
1879     element = $(element), ancestor = $(ancestor);
1880
1881     if (element.compareDocumentPosition)
1882       return (element.compareDocumentPosition(ancestor) & 8) === 8;
1883
1884     if (ancestor.contains)
1885       return ancestor.contains(element) && ancestor !== element;
1886
1887     while (element = element.parentNode)
1888       if (element == ancestor) return true;
1889
1890     return false;
1891   },
1892
1893   scrollTo: function(element) {
1894     element = $(element);
1895     var pos = element.cumulativeOffset();
1896     window.scrollTo(pos[0], pos[1]);
1897     return element;
1898   },
1899
1900   getStyle: function(element, style) {
1901     element = $(element);
1902     style = style == 'float' ? 'cssFloat' : style.camelize();
1903     var value = element.style[style];
1904     if (!value || value == 'auto') {
1905       var css = document.defaultView.getComputedStyle(element, null);
1906       value = css ? css[style] : null;
1907     }
1908     if (style == 'opacity') return value ? parseFloat(value) : 1.0;
1909     return value == 'auto' ? null : value;
1910   },
1911
1912   getOpacity: function(element) {
1913     return $(element).getStyle('opacity');
1914   },
1915
1916   setStyle: function(element, styles) {
1917     element = $(element);
1918     var elementStyle = element.style, match;
1919     if (Object.isString(styles)) {
1920       element.style.cssText += ';' + styles;
1921       return styles.include('opacity') ?
1922         element.setOpacity(styles.match(/opacity:\s*(\d?\.?\d*)/)[1]) : element;
1923     }
1924     for (var property in styles)
1925       if (property == 'opacity') element.setOpacity(styles[property]);
1926       else
1927         elementStyle[(property == 'float' || property == 'cssFloat') ?
1928           (Object.isUndefined(elementStyle.styleFloat) ? 'cssFloat' : 'styleFloat') :
1929             property] = styles[property];
1930
1931     return element;
1932   },
1933
1934   setOpacity: function(element, value) {
1935     element = $(element);
1936     element.style.opacity = (value == 1 || value === '') ? '' :
1937       (value < 0.00001) ? 0 : value;
1938     return element;
1939   },
1940
1941   getDimensions: function(element) {
1942     element = $(element);
1943     var display = element.getStyle('display');
1944     if (display != 'none' && display != null) // Safari bug
1945       return {width: element.offsetWidth, height: element.offsetHeight};
1946
1947     // All *Width and *Height properties give 0 on elements with display none,
1948     // so enable the element temporarily
1949     var els = element.style;
1950     var originalVisibility = els.visibility;
1951     var originalPosition = els.position;
1952     var originalDisplay = els.display;
1953     els.visibility = 'hidden';
1954     els.position = 'absolute';
1955     els.display = 'block';
1956     var originalWidth = element.clientWidth;
1957     var originalHeight = element.clientHeight;
1958     els.display = originalDisplay;
1959     els.position = originalPosition;
1960     els.visibility = originalVisibility;
1961     return {width: originalWidth, height: originalHeight};
1962   },
1963
1964   makePositioned: function(element) {
1965     element = $(element);
1966     var pos = Element.getStyle(element, 'position');
1967     if (pos == 'static' || !pos) {
1968       element._madePositioned = true;
1969       element.style.position = 'relative';
1970       // Opera returns the offset relative to the positioning context, when an
1971       // element is position relative but top and left have not been defined
1972       if (Prototype.Browser.Opera) {
1973         element.style.top = 0;
1974         element.style.left = 0;
1975       }
1976     }
1977     return element;
1978   },
1979
1980   undoPositioned: function(element) {
1981     element = $(element);
1982     if (element._madePositioned) {
1983       element._madePositioned = undefined;
1984       element.style.position =
1985         element.style.top =
1986         element.style.left =
1987         element.style.bottom =
1988         element.style.right = '';
1989     }
1990     return element;
1991   },
1992
1993   makeClipping: function(element) {
1994     element = $(element);
1995     if (element._overflow) return element;
1996     element._overflow = Element.getStyle(element, 'overflow') || 'auto';
1997     if (element._overflow !== 'hidden')
1998       element.style.overflow = 'hidden';
1999     return element;
2000   },
2001
2002   undoClipping: function(element) {
2003     element = $(element);
2004     if (!element._overflow) return element;
2005     element.style.overflow = element._overflow == 'auto' ? '' : element._overflow;
2006     element._overflow = null;
2007     return element;
2008   },
2009
2010   cumulativeOffset: function(element) {
2011     var valueT = 0, valueL = 0;
2012     do {
2013       valueT += element.offsetTop  || 0;
2014       valueL += element.offsetLeft || 0;
2015       element = element.offsetParent;
2016     } while (element);
2017     return Element._returnOffset(valueL, valueT);
2018   },
2019
2020   positionedOffset: function(element) {
2021     var valueT = 0, valueL = 0;
2022     do {
2023       valueT += element.offsetTop  || 0;
2024       valueL += element.offsetLeft || 0;
2025       element = element.offsetParent;
2026       if (element) {
2027         if (element.tagName.toUpperCase() == 'BODY') break;
2028         var p = Element.getStyle(element, 'position');
2029         if (p !== 'static') break;
2030       }
2031     } while (element);
2032     return Element._returnOffset(valueL, valueT);
2033   },
2034
2035   absolutize: function(element) {
2036     element = $(element);
2037     if (element.getStyle('position') == 'absolute') return element;
2038     // Position.prepare(); // To be done manually by Scripty when it needs it.
2039
2040     var offsets = element.positionedOffset();
2041     var top     = offsets[1];
2042     var left    = offsets[0];
2043     var width   = element.clientWidth;
2044     var height  = element.clientHeight;
2045
2046     element._originalLeft   = left - parseFloat(element.style.left  || 0);
2047     element._originalTop    = top  - parseFloat(element.style.top || 0);
2048     element._originalWidth  = element.style.width;
2049     element._originalHeight = element.style.height;
2050
2051     element.style.position = 'absolute';
2052     element.style.top    = top + 'px';
2053     element.style.left   = left + 'px';
2054     element.style.width  = width + 'px';
2055     element.style.height = height + 'px';
2056     return element;
2057   },
2058
2059   relativize: function(element) {
2060     element = $(element);
2061     if (element.getStyle('position') == 'relative') return element;
2062     // Position.prepare(); // To be done manually by Scripty when it needs it.
2063
2064     element.style.position = 'relative';
2065     var top  = parseFloat(element.style.top  || 0) - (element._originalTop || 0);
2066     var left = parseFloat(element.style.left || 0) - (element._originalLeft || 0);
2067
2068     element.style.top    = top + 'px';
2069     element.style.left   = left + 'px';
2070     element.style.height = element._originalHeight;
2071     element.style.width  = element._originalWidth;
2072     return element;
2073   },
2074
2075   cumulativeScrollOffset: function(element) {
2076     var valueT = 0, valueL = 0;
2077     do {
2078       valueT += element.scrollTop  || 0;
2079       valueL += element.scrollLeft || 0;
2080       element = element.parentNode;
2081     } while (element);
2082     return Element._returnOffset(valueL, valueT);
2083   },
2084
2085   getOffsetParent: function(element) {
2086     if (element.offsetParent) return $(element.offsetParent);
2087     if (element == document.body) return $(element);
2088
2089     while ((element = element.parentNode) && element != document.body)
2090       if (Element.getStyle(element, 'position') != 'static')
2091         return $(element);
2092
2093     return $(document.body);
2094   },
2095
2096   viewportOffset: function(forElement) {
2097     var valueT = 0, valueL = 0;
2098
2099     var element = forElement;
2100     do {
2101       valueT += element.offsetTop  || 0;
2102       valueL += element.offsetLeft || 0;
2103
2104       // Safari fix
2105       if (element.offsetParent == document.body &&
2106         Element.getStyle(element, 'position') == 'absolute') break;
2107
2108     } while (element = element.offsetParent);
2109
2110     element = forElement;
2111     do {
2112       if (!Prototype.Browser.Opera || (element.tagName && (element.tagName.toUpperCase() == 'BODY'))) {
2113         valueT -= element.scrollTop  || 0;
2114         valueL -= element.scrollLeft || 0;
2115       }
2116     } while (element = element.parentNode);
2117
2118     return Element._returnOffset(valueL, valueT);
2119   },
2120
2121   clonePosition: function(element, source) {
2122     var options = Object.extend({
2123       setLeft:    true,
2124       setTop:     true,
2125       setWidth:   true,
2126       setHeight:  true,
2127       offsetTop:  0,
2128       offsetLeft: 0
2129     }, arguments[2] || { });
2130
2131     // find page position of source
2132     source = $(source);
2133     var p = source.viewportOffset();
2134
2135     // find coordinate system to use
2136     element = $(element);
2137     var delta = [0, 0];
2138     var parent = null;
2139     // delta [0,0] will do fine with position: fixed elements,
2140     // position:absolute needs offsetParent deltas
2141     if (Element.getStyle(element, 'position') == 'absolute') {
2142       parent = element.getOffsetParent();
2143       delta = parent.viewportOffset();
2144     }
2145
2146     // correct by body offsets (fixes Safari)
2147     if (parent == document.body) {
2148       delta[0] -= document.body.offsetLeft;
2149       delta[1] -= document.body.offsetTop;
2150     }
2151
2152     // set position
2153     if (options.setLeft)   element.style.left  = (p[0] - delta[0] + options.offsetLeft) + 'px';
2154     if (options.setTop)    element.style.top   = (p[1] - delta[1] + options.offsetTop) + 'px';
2155     if (options.setWidth)  element.style.width = source.offsetWidth + 'px';
2156     if (options.setHeight) element.style.height = source.offsetHeight + 'px';
2157     return element;
2158   }
2159 };
2160
2161 Element.Methods.identify.counter = 1;
2162
2163 Object.extend(Element.Methods, {
2164   getElementsBySelector: Element.Methods.select,
2165   childElements: Element.Methods.immediateDescendants
2166 });
2167
2168 Element._attributeTranslations = {
2169   write: {
2170     names: {
2171       className: 'class',
2172       htmlFor:   'for'
2173     },
2174     values: { }
2175   }
2176 };
2177
2178 if (Prototype.Browser.Opera) {
2179   Element.Methods.getStyle = Element.Methods.getStyle.wrap(
2180     function(proceed, element, style) {
2181       switch (style) {
2182         case 'left': case 'top': case 'right': case 'bottom':
2183           if (proceed(element, 'position') === 'static') return null;
2184         case 'height': case 'width':
2185           // returns '0px' for hidden elements; we want it to return null
2186           if (!Element.visible(element)) return null;
2187
2188           // returns the border-box dimensions rather than the content-box
2189           // dimensions, so we subtract padding and borders from the value
2190           var dim = parseInt(proceed(element, style), 10);
2191
2192           if (dim !== element['offset' + style.capitalize()])
2193             return dim + 'px';
2194
2195           var properties;
2196           if (style === 'height') {
2197             properties = ['border-top-width', 'padding-top',
2198              'padding-bottom', 'border-bottom-width'];
2199           }
2200           else {
2201             properties = ['border-left-width', 'padding-left',
2202              'padding-right', 'border-right-width'];
2203           }
2204           return properties.inject(dim, function(memo, property) {
2205             var val = proceed(element, property);
2206             return val === null ? memo : memo - parseInt(val, 10);
2207           }) + 'px';
2208         default: return proceed(element, style);
2209       }
2210     }
2211   );
2212
2213   Element.Methods.readAttribute = Element.Methods.readAttribute.wrap(
2214     function(proceed, element, attribute) {
2215       if (attribute === 'title') return element.title;
2216       return proceed(element, attribute);
2217     }
2218   );
2219 }
2220
2221 else if (Prototype.Browser.IE) {
2222   // IE doesn't report offsets correctly for static elements, so we change them
2223   // to "relative" to get the values, then change them back.
2224   Element.Methods.getOffsetParent = Element.Methods.getOffsetParent.wrap(
2225     function(proceed, element) {
2226       element = $(element);
2227       // IE throws an error if element is not in document
2228       try { element.offsetParent }
2229       catch(e) { return $(document.body) }
2230       var position = element.getStyle('position');
2231       if (position !== 'static') return proceed(element);
2232       element.setStyle({ position: 'relative' });
2233       var value = proceed(element);
2234       element.setStyle({ position: position });
2235       return value;
2236     }
2237   );
2238
2239   $w('positionedOffset viewportOffset').each(function(method) {
2240     Element.Methods[method] = Element.Methods[method].wrap(
2241       function(proceed, element) {
2242         element = $(element);
2243         try { element.offsetParent }
2244         catch(e) { return Element._returnOffset(0,0) }
2245         var position = element.getStyle('position');
2246         if (position !== 'static') return proceed(element);
2247         // Trigger hasLayout on the offset parent so that IE6 reports
2248         // accurate offsetTop and offsetLeft values for position: fixed.
2249         var offsetParent = element.getOffsetParent();
2250         if (offsetParent && offsetParent.getStyle('position') === 'fixed')
2251           offsetParent.setStyle({ zoom: 1 });
2252         element.setStyle({ position: 'relative' });
2253         var value = proceed(element);
2254         element.setStyle({ position: position });
2255         return value;
2256       }
2257     );
2258   });
2259
2260   Element.Methods.cumulativeOffset = Element.Methods.cumulativeOffset.wrap(
2261     function(proceed, element) {
2262       try { element.offsetParent }
2263       catch(e) { return Element._returnOffset(0,0) }
2264       return proceed(element);
2265     }
2266   );
2267
2268   Element.Methods.getStyle = function(element, style) {
2269     element = $(element);
2270     style = (style == 'float' || style == 'cssFloat') ? 'styleFloat' : style.camelize();
2271     var value = element.style[style];
2272     if (!value && element.currentStyle) value = element.currentStyle[style];
2273
2274     if (style == 'opacity') {
2275       if (value = (element.getStyle('filter') || '').match(/alpha\(opacity=(.*)\)/))
2276         if (value[1]) return parseFloat(value[1]) / 100;
2277       return 1.0;
2278     }
2279
2280     if (value == 'auto') {
2281       if ((style == 'width' || style == 'height') && (element.getStyle('display') != 'none'))
2282         return element['offset' + style.capitalize()] + 'px';
2283       return null;
2284     }
2285     return value;
2286   };
2287
2288   Element.Methods.setOpacity = function(element, value) {
2289     function stripAlpha(filter){
2290       return filter.replace(/alpha\([^\)]*\)/gi,'');
2291     }
2292     element = $(element);
2293     var currentStyle = element.currentStyle;
2294     if ((currentStyle && !currentStyle.hasLayout) ||
2295       (!currentStyle && element.style.zoom == 'normal'))
2296         element.style.zoom = 1;
2297
2298     var filter = element.getStyle('filter'), style = element.style;
2299     if (value == 1 || value === '') {
2300       (filter = stripAlpha(filter)) ?
2301         style.filter = filter : style.removeAttribute('filter');
2302       return element;
2303     } else if (value < 0.00001) value = 0;
2304     style.filter = stripAlpha(filter) +
2305       'alpha(opacity=' + (value * 100) + ')';
2306     return element;
2307   };
2308
2309   Element._attributeTranslations = {
2310     read: {
2311       names: {
2312         'class': 'className',
2313         'for':   'htmlFor'
2314       },
2315       values: {
2316         _getAttr: function(element, attribute) {
2317           return element.getAttribute(attribute, 2);
2318         },
2319         _getAttrNode: function(element, attribute) {
2320           var node = element.getAttributeNode(attribute);
2321           return node ? node.value : "";
2322         },
2323         _getEv: function(element, attribute) {
2324           attribute = element.getAttribute(attribute);
2325           return attribute ? attribute.toString().slice(23, -2) : null;
2326         },
2327         _flag: function(element, attribute) {
2328           return $(element).hasAttribute(attribute) ? attribute : null;
2329         },
2330         style: function(element) {
2331           return element.style.cssText.toLowerCase();
2332         },
2333         title: function(element) {
2334           return element.title;
2335         }
2336       }
2337     }
2338   };
2339
2340   Element._attributeTranslations.write = {
2341     names: Object.extend({
2342       cellpadding: 'cellPadding',
2343       cellspacing: 'cellSpacing'
2344     }, Element._attributeTranslations.read.names),
2345     values: {
2346       checked: function(element, value) {
2347         element.checked = !!value;
2348       },
2349
2350       style: function(element, value) {
2351         element.style.cssText = value ? value : '';
2352       }
2353     }
2354   };
2355
2356   Element._attributeTranslations.has = {};
2357
2358   $w('colSpan rowSpan vAlign dateTime accessKey tabIndex ' +
2359       'encType maxLength readOnly longDesc frameBorder').each(function(attr) {
2360     Element._attributeTranslations.write.names[attr.toLowerCase()] = attr;
2361     Element._attributeTranslations.has[attr.toLowerCase()] = attr;
2362   });
2363
2364   (function(v) {
2365     Object.extend(v, {
2366       href:        v._getAttr,
2367       src:         v._getAttr,
2368       type:        v._getAttr,
2369       action:      v._getAttrNode,
2370       disabled:    v._flag,
2371       checked:     v._flag,
2372       readonly:    v._flag,
2373       multiple:    v._flag,
2374       onload:      v._getEv,
2375       onunload:    v._getEv,
2376       onclick:     v._getEv,
2377       ondblclick:  v._getEv,
2378       onmousedown: v._getEv,
2379       onmouseup:   v._getEv,
2380       onmouseover: v._getEv,
2381       onmousemove: v._getEv,
2382       onmouseout:  v._getEv,
2383       onfocus:     v._getEv,
2384       onblur:      v._getEv,
2385       onkeypress:  v._getEv,
2386       onkeydown:   v._getEv,
2387       onkeyup:     v._getEv,
2388       onsubmit:    v._getEv,
2389       onreset:     v._getEv,
2390       onselect:    v._getEv,
2391       onchange:    v._getEv
2392     });
2393   })(Element._attributeTranslations.read.values);
2394 }
2395
2396 else if (Prototype.Browser.Gecko && /rv:1\.8\.0/.test(navigator.userAgent)) {
2397   Element.Methods.setOpacity = function(element, value) {
2398     element = $(element);
2399     element.style.opacity = (value == 1) ? 0.999999 :
2400       (value === '') ? '' : (value < 0.00001) ? 0 : value;
2401     return element;
2402   };
2403 }
2404
2405 else if (Prototype.Browser.WebKit) {
2406   Element.Methods.setOpacity = function(element, value) {
2407     element = $(element);
2408     element.style.opacity = (value == 1 || value === '') ? '' :
2409       (value < 0.00001) ? 0 : value;
2410
2411     if (value == 1)
2412       if(element.tagName.toUpperCase() == 'IMG' && element.width) {
2413         element.width++; element.width--;
2414       } else try {
2415         var n = document.createTextNode(' ');
2416         element.appendChild(n);
2417         element.removeChild(n);
2418       } catch (e) { }
2419
2420     return element;
2421   };
2422
2423   // Safari returns margins on body which is incorrect if the child is absolutely
2424   // positioned.  For performance reasons, redefine Element#cumulativeOffset for
2425   // KHTML/WebKit only.
2426   Element.Methods.cumulativeOffset = function(element) {
2427     var valueT = 0, valueL = 0;
2428     do {
2429       valueT += element.offsetTop  || 0;
2430       valueL += element.offsetLeft || 0;
2431       if (element.offsetParent == document.body)
2432         if (Element.getStyle(element, 'position') == 'absolute') break;
2433
2434       element = element.offsetParent;
2435     } while (element);
2436
2437     return Element._returnOffset(valueL, valueT);
2438   };
2439 }
2440
2441 if (Prototype.Browser.IE || Prototype.Browser.Opera) {
2442   // IE and Opera are missing .innerHTML support for TABLE-related and SELECT elements
2443   Element.Methods.update = function(element, content) {
2444     element = $(element);
2445
2446     if (content && content.toElement) content = content.toElement();
2447     if (Object.isElement(content)) return element.update().insert(content);
2448
2449     content = Object.toHTML(content);
2450     var tagName = element.tagName.toUpperCase();
2451
2452     if (tagName in Element._insertionTranslations.tags) {
2453       $A(element.childNodes).each(function(node) { element.removeChild(node) });
2454       Element._getContentFromAnonymousElement(tagName, content.stripScripts())
2455         .each(function(node) { element.appendChild(node) });
2456     }
2457     else element.innerHTML = content.stripScripts();
2458
2459     content.evalScripts.bind(content).defer();
2460     return element;
2461   };
2462 }
2463
2464 if ('outerHTML' in document.createElement('div')) {
2465   Element.Methods.replace = function(element, content) {
2466     element = $(element);
2467
2468     if (content && content.toElement) content = content.toElement();
2469     if (Object.isElement(content)) {
2470       element.parentNode.replaceChild(content, element);
2471       return element;
2472     }
2473
2474     content = Object.toHTML(content);
2475     var parent = element.parentNode, tagName = parent.tagName.toUpperCase();
2476
2477     if (Element._insertionTranslations.tags[tagName]) {
2478       var nextSibling = element.next();
2479       var fragments = Element._getContentFromAnonymousElement(tagName, content.stripScripts());
2480       parent.removeChild(element);
2481       if (nextSibling)
2482         fragments.each(function(node) { parent.insertBefore(node, nextSibling) });
2483       else
2484         fragments.each(function(node) { parent.appendChild(node) });
2485     }
2486     else element.outerHTML = content.stripScripts();
2487
2488     content.evalScripts.bind(content).defer();
2489     return element;
2490   };
2491 }
2492
2493 Element._returnOffset = function(l, t) {
2494   var result = [l, t];
2495   result.left = l;
2496   result.top = t;
2497   return result;
2498 };
2499
2500 Element._getContentFromAnonymousElement = function(tagName, html) {
2501   var div = new Element('div'), t = Element._insertionTranslations.tags[tagName];
2502   if (t) {
2503     div.innerHTML = t[0] + html + t[1];
2504     t[2].times(function() { div = div.firstChild });
2505   } else div.innerHTML = html;
2506   return $A(div.childNodes);
2507 };
2508
2509 Element._insertionTranslations = {
2510   before: function(element, node) {
2511     element.parentNode.insertBefore(node, element);
2512   },
2513   top: function(element, node) {
2514     element.insertBefore(node, element.firstChild);
2515   },
2516   bottom: function(element, node) {
2517     element.appendChild(node);
2518   },
2519   after: function(element, node) {
2520     element.parentNode.insertBefore(node, element.nextSibling);
2521   },
2522   tags: {
2523     TABLE:  ['<table>',                '</table>',                   1],
2524     TBODY:  ['<table><tbody>',         '</tbody></table>',           2],
2525     TR:     ['<table><tbody><tr>',     '</tr></tbody></table>',      3],
2526     TD:     ['<table><tbody><tr><td>', '</td></tr></tbody></table>', 4],
2527     SELECT: ['<select>',               '</select>',                  1]
2528   }
2529 };
2530
2531 (function() {
2532   Object.extend(this.tags, {
2533     THEAD: this.tags.TBODY,
2534     TFOOT: this.tags.TBODY,
2535     TH:    this.tags.TD
2536   });
2537 }).call(Element._insertionTranslations);
2538
2539 Element.Methods.Simulated = {
2540   hasAttribute: function(element, attribute) {
2541     attribute = Element._attributeTranslations.has[attribute] || attribute;
2542     var node = $(element).getAttributeNode(attribute);
2543     return !!(node && node.specified);
2544   }
2545 };
2546
2547 Element.Methods.ByTag = { };
2548
2549 Object.extend(Element, Element.Methods);
2550
2551 if (!Prototype.BrowserFeatures.ElementExtensions &&
2552     document.createElement('div')['__proto__']) {
2553   window.HTMLElement = { };
2554   window.HTMLElement.prototype = document.createElement('div')['__proto__'];
2555   Prototype.BrowserFeatures.ElementExtensions = true;
2556 }
2557
2558 Element.extend = (function() {
2559   if (Prototype.BrowserFeatures.SpecificElementExtensions)
2560     return Prototype.K;
2561
2562   var Methods = { }, ByTag = Element.Methods.ByTag;
2563
2564   var extend = Object.extend(function(element) {
2565     if (!element || element._extendedByPrototype ||
2566         element.nodeType != 1 || element == window) return element;
2567
2568     var methods = Object.clone(Methods),
2569       tagName = element.tagName.toUpperCase(), property, value;
2570
2571     // extend methods for specific tags
2572     if (ByTag[tagName]) Object.extend(methods, ByTag[tagName]);
2573
2574     for (property in methods) {
2575       value = methods[property];
2576       if (Object.isFunction(value) && !(property in element))
2577         element[property] = value.methodize();
2578     }
2579
2580     element._extendedByPrototype = Prototype.emptyFunction;
2581     return element;
2582
2583   }, {
2584     refresh: function() {
2585       // extend methods for all tags (Safari doesn't need this)
2586       if (!Prototype.BrowserFeatures.ElementExtensions) {
2587         Object.extend(Methods, Element.Methods);
2588         Object.extend(Methods, Element.Methods.Simulated);
2589       }
2590     }
2591   });
2592
2593   extend.refresh();
2594   return extend;
2595 })();
2596
2597 Element.hasAttribute = function(element, attribute) {
2598   if (element.hasAttribute) return element.hasAttribute(attribute);
2599   return Element.Methods.Simulated.hasAttribute(element, attribute);
2600 };
2601
2602 Element.addMethods = function(methods) {
2603   var F = Prototype.BrowserFeatures, T = Element.Methods.ByTag;
2604
2605   if (!methods) {
2606     Object.extend(Form, Form.Methods);
2607     Object.extend(Form.Element, Form.Element.Methods);
2608     Object.extend(Element.Methods.ByTag, {
2609       "FORM":     Object.clone(Form.Methods),
2610       "INPUT":    Object.clone(Form.Element.Methods),
2611       "SELECT":   Object.clone(Form.Element.Methods),
2612       "TEXTAREA": Object.clone(Form.Element.Methods)
2613     });
2614   }
2615
2616   if (arguments.length == 2) {
2617     var tagName = methods;
2618     methods = arguments[1];
2619   }
2620
2621   if (!tagName) Object.extend(Element.Methods, methods || { });
2622   else {
2623     if (Object.isArray(tagName)) tagName.each(extend);
2624     else extend(tagName);
2625   }
2626
2627   function extend(tagName) {
2628     tagName = tagName.toUpperCase();
2629     if (!Element.Methods.ByTag[tagName])
2630       Element.Methods.ByTag[tagName] = { };
2631     Object.extend(Element.Methods.ByTag[tagName], methods);
2632   }
2633
2634   function copy(methods, destination, onlyIfAbsent) {
2635     onlyIfAbsent = onlyIfAbsent || false;
2636     for (var property in methods) {
2637       var value = methods[property];
2638       if (!Object.isFunction(value)) continue;
2639       if (!onlyIfAbsent || !(property in destination))
2640         destination[property] = value.methodize();
2641     }
2642   }
2643
2644   function findDOMClass(tagName) {
2645     var klass;
2646     var trans = {
2647       "OPTGROUP": "OptGroup", "TEXTAREA": "TextArea", "P": "Paragraph",
2648       "FIELDSET": "FieldSet", "UL": "UList", "OL": "OList", "DL": "DList",
2649       "DIR": "Directory", "H1": "Heading", "H2": "Heading", "H3": "Heading",
2650       "H4": "Heading", "H5": "Heading", "H6": "Heading", "Q": "Quote",
2651       "INS": "Mod", "DEL": "Mod", "A": "Anchor", "IMG": "Image", "CAPTION":
2652       "TableCaption", "COL": "TableCol", "COLGROUP": "TableCol", "THEAD":
2653       "TableSection", "TFOOT": "TableSection", "TBODY": "TableSection", "TR":
2654       "TableRow", "TH": "TableCell", "TD": "TableCell", "FRAMESET":
2655       "FrameSet", "IFRAME": "IFrame"
2656     };
2657     if (trans[tagName]) klass = 'HTML' + trans[tagName] + 'Element';
2658     if (window[klass]) return window[klass];
2659     klass = 'HTML' + tagName + 'Element';
2660     if (window[klass]) return window[klass];
2661     klass = 'HTML' + tagName.capitalize() + 'Element';
2662     if (window[klass]) return window[klass];
2663
2664     window[klass] = { };
2665     window[klass].prototype = document.createElement(tagName)['__proto__'];
2666     return window[klass];
2667   }
2668
2669   if (F.ElementExtensions) {
2670     copy(Element.Methods, HTMLElement.prototype);
2671     copy(Element.Methods.Simulated, HTMLElement.prototype, true);
2672   }
2673
2674   if (F.SpecificElementExtensions) {
2675     for (var tag in Element.Methods.ByTag) {
2676       var klass = findDOMClass(tag);
2677       if (Object.isUndefined(klass)) continue;
2678       copy(T[tag], klass.prototype);
2679     }
2680   }
2681
2682   Object.extend(Element, Element.Methods);
2683   delete Element.ByTag;
2684
2685   if (Element.extend.refresh) Element.extend.refresh();
2686   Element.cache = { };
2687 };
2688
2689 document.viewport = {
2690   getDimensions: function() {
2691     var dimensions = { }, B = Prototype.Browser;
2692     $w('width height').each(function(d) {
2693       var D = d.capitalize();
2694       if (B.WebKit && !document.evaluate) {
2695         // Safari <3.0 needs self.innerWidth/Height
2696         dimensions[d] = self['inner' + D];
2697       } else if (B.Opera && parseFloat(window.opera.version()) < 9.5) {
2698         // Opera <9.5 needs document.body.clientWidth/Height
2699         dimensions[d] = document.body['client' + D]
2700       } else {
2701         dimensions[d] = document.documentElement['client' + D];
2702       }
2703     });
2704     return dimensions;
2705   },
2706
2707   getWidth: function() {
2708     return this.getDimensions().width;
2709   },
2710
2711   getHeight: function() {
2712     return this.getDimensions().height;
2713   },
2714
2715   getScrollOffsets: function() {
2716     return Element._returnOffset(
2717       window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft,
2718       window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop);
2719   }
2720 };
2721 /* Portions of the Selector class are derived from Jack Slocum's DomQuery,
2722  * part of YUI-Ext version 0.40, distributed under the terms of an MIT-style
2723  * license.  Please see http://www.yui-ext.com/ for more information. */
2724
2725 var Selector = Class.create({
2726   initialize: function(expression) {
2727     this.expression = expression.strip();
2728
2729     if (this.shouldUseSelectorsAPI()) {
2730       this.mode = 'selectorsAPI';
2731     } else if (this.shouldUseXPath()) {
2732       this.mode = 'xpath';
2733       this.compileXPathMatcher();
2734     } else {
2735       this.mode = "normal";
2736       this.compileMatcher();
2737     }
2738
2739   },
2740
2741   shouldUseXPath: function() {
2742     if (!Prototype.BrowserFeatures.XPath) return false;
2743
2744     var e = this.expression;
2745
2746     // Safari 3 chokes on :*-of-type and :empty
2747     if (Prototype.Browser.WebKit &&
2748      (e.include("-of-type") || e.include(":empty")))
2749       return false;
2750
2751     // XPath can't do namespaced attributes, nor can it read
2752     // the "checked" property from DOM nodes
2753     if ((/(\[[\w-]*?:|:checked)/).test(e))
2754       return false;
2755
2756     return true;
2757   },
2758
2759   shouldUseSelectorsAPI: function() {
2760     if (!Prototype.BrowserFeatures.SelectorsAPI) return false;
2761
2762     if (!Selector._div) Selector._div = new Element('div');
2763
2764     // Make sure the browser treats the selector as valid. Test on an
2765     // isolated element to minimize cost of this check.
2766     try {
2767       Selector._div.querySelector(this.expression);
2768     } catch(e) {
2769       return false;
2770     }
2771
2772     return true;
2773   },
2774
2775   compileMatcher: function() {
2776     var e = this.expression, ps = Selector.patterns, h = Selector.handlers,
2777         c = Selector.criteria, le, p, m;
2778
2779     if (Selector._cache[e]) {
2780       this.matcher = Selector._cache[e];
2781       return;
2782     }
2783
2784     this.matcher = ["this.matcher = function(root) {",
2785                     "var r = root, h = Selector.handlers, c = false, n;"];
2786
2787     while (e && le != e && (/\S/).test(e)) {
2788       le = e;
2789       for (var i in ps) {
2790         p = ps[i];
2791         if (m = e.match(p)) {
2792           this.matcher.push(Object.isFunction(c[i]) ? c[i](m) :
2793             new Template(c[i]).evaluate(m));
2794           e = e.replace(m[0], '');
2795           break;
2796         }
2797       }
2798     }
2799
2800     this.matcher.push("return h.unique(n);\n}");
2801     eval(this.matcher.join('\n'));
2802     Selector._cache[this.expression] = this.matcher;
2803   },
2804
2805   compileXPathMatcher: function() {
2806     var e = this.expression, ps = Selector.patterns,
2807         x = Selector.xpath, le, m;
2808
2809     if (Selector._cache[e]) {
2810       this.xpath = Selector._cache[e]; return;
2811     }
2812
2813     this.matcher = ['.//*'];
2814     while (e && le != e && (/\S/).test(e)) {
2815       le = e;
2816       for (var i in ps) {
2817         if (m = e.match(ps[i])) {
2818           this.matcher.push(Object.isFunction(x[i]) ? x[i](m) :
2819             new Template(x[i]).evaluate(m));
2820           e = e.replace(m[0], '');
2821           break;
2822         }
2823       }
2824     }
2825
2826     this.xpath = this.matcher.join('');
2827     Selector._cache[this.expression] = this.xpath;
2828   },
2829
2830   findElements: function(root) {
2831     root = root || document;
2832     var e = this.expression, results;
2833
2834     switch (this.mode) {
2835       case 'selectorsAPI':
2836         // querySelectorAll queries document-wide, then filters to descendants
2837         // of the context element. That's not what we want.
2838         // Add an explicit context to the selector if necessary.
2839         if (root !== document) {
2840           var oldId = root.id, id = $(root).identify();
2841           e = "#" + id + " " + e;
2842         }
2843
2844         results = $A(root.querySelectorAll(e)).map(Element.extend);
2845         root.id = oldId;
2846
2847         return results;
2848       case 'xpath':
2849         return document._getElementsByXPath(this.xpath, root);
2850       default:
2851        return this.matcher(root);
2852     }
2853   },
2854
2855   match: function(element) {
2856     this.tokens = [];
2857
2858     var e = this.expression, ps = Selector.patterns, as = Selector.assertions;
2859     var le, p, m;
2860
2861     while (e && le !== e && (/\S/).test(e)) {
2862       le = e;
2863       for (var i in ps) {
2864         p = ps[i];
2865         if (m = e.match(p)) {
2866           // use the Selector.assertions methods unless the selector
2867           // is too complex.
2868           if (as[i]) {
2869             this.tokens.push([i, Object.clone(m)]);
2870             e = e.replace(m[0], '');
2871           } else {
2872             // reluctantly do a document-wide search
2873             // and look for a match in the array
2874             return this.findElements(document).include(element);
2875           }
2876         }
2877       }
2878     }
2879
2880     var match = true, name, matches;
2881     for (var i = 0, token; token = this.tokens[i]; i++) {
2882       name = token[0], matches = token[1];
2883       if (!Selector.assertions[name](element, matches)) {
2884         match = false; break;
2885       }
2886     }
2887
2888     return match;
2889   },
2890
2891   toString: function() {
2892     return this.expression;
2893   },
2894
2895   inspect: function() {
2896     return "#<Selector:" + this.expression.inspect() + ">";
2897   }
2898 });
2899
2900 Object.extend(Selector, {
2901   _cache: { },
2902
2903   xpath: {
2904     descendant:   "//*",
2905     child:        "/*",
2906     adjacent:     "/following-sibling::*[1]",
2907     laterSibling: '/following-sibling::*',
2908     tagName:      function(m) {
2909       if (m[1] == '*') return '';
2910       return "[local-name()='" + m[1].toLowerCase() +
2911              "' or local-name()='" + m[1].toUpperCase() + "']";
2912     },
2913     className:    "[contains(concat(' ', @class, ' '), ' #{1} ')]",
2914     id:           "[@id='#{1}']",
2915     attrPresence: function(m) {
2916       m[1] = m[1].toLowerCase();
2917       return new Template("[@#{1}]").evaluate(m);
2918     },
2919     attr: function(m) {
2920       m[1] = m[1].toLowerCase();
2921       m[3] = m[5] || m[6];
2922       return new Template(Selector.xpath.operators[m[2]]).evaluate(m);
2923     },
2924     pseudo: function(m) {
2925       var h = Selector.xpath.pseudos[m[1]];
2926       if (!h) return '';
2927       if (Object.isFunction(h)) return h(m);
2928       return new Template(Selector.xpath.pseudos[m[1]]).evaluate(m);
2929     },
2930     operators: {
2931       '=':  "[@#{1}='#{3}']",
2932       '!=': "[@#{1}!='#{3}']",
2933       '^=': "[starts-with(@#{1}, '#{3}')]",
2934       '$=': "[substring(@#{1}, (string-length(@#{1}) - string-length('#{3}') + 1))='#{3}']",
2935       '*=': "[contains(@#{1}, '#{3}')]",
2936       '~=': "[contains(concat(' ', @#{1}, ' '), ' #{3} ')]",
2937       '|=': "[contains(concat('-', @#{1}, '-'), '-#{3}-')]"
2938     },
2939     pseudos: {
2940       'first-child': '[not(preceding-sibling::*)]',
2941       'last-child':  '[not(following-sibling::*)]',
2942       'only-child':  '[not(preceding-sibling::* or following-sibling::*)]',
2943       'empty':       "[count(*) = 0 and (count(text()) = 0)]",
2944       'checked':     "[@checked]",
2945       'disabled':    "[(@disabled) and (@type!='hidden')]",
2946       'enabled':     "[not(@disabled) and (@type!='hidden')]",
2947       'not': function(m) {
2948         var e = m[6], p = Selector.patterns,
2949             x = Selector.xpath, le, v;
2950
2951         var exclusion = [];
2952         while (e && le != e && (/\S/).test(e)) {
2953           le = e;
2954           for (var i in p) {
2955             if (m = e.match(p[i])) {
2956               v = Object.isFunction(x[i]) ? x[i](m) : new Template(x[i]).evaluate(m);
2957               exclusion.push("(" + v.substring(1, v.length - 1) + ")");
2958               e = e.replace(m[0], '');
2959               break;
2960             }
2961           }
2962         }
2963         return "[not(" + exclusion.join(" and ") + ")]";
2964       },
2965       'nth-child':      function(m) {
2966         return Selector.xpath.pseudos.nth("(count(./preceding-sibling::*) + 1) ", m);
2967       },
2968       'nth-last-child': function(m) {
2969         return Selector.xpath.pseudos.nth("(count(./following-sibling::*) + 1) ", m);
2970       },
2971       'nth-of-type':    function(m) {
2972         return Selector.xpath.pseudos.nth("position() ", m);
2973       },
2974       'nth-last-of-type': function(m) {
2975         return Selector.xpath.pseudos.nth("(last() + 1 - position()) ", m);
2976       },
2977       'first-of-type':  function(m) {
2978         m[6] = "1"; return Selector.xpath.pseudos['nth-of-type'](m);
2979       },
2980       'last-of-type':   function(m) {
2981         m[6] = "1"; return Selector.xpath.pseudos['nth-last-of-type'](m);
2982       },
2983       'only-of-type':   function(m) {
2984         var p = Selector.xpath.pseudos; return p['first-of-type'](m) + p['last-of-type'](m);
2985       },
2986       nth: function(fragment, m) {
2987         var mm, formula = m[6], predicate;
2988         if (formula == 'even') formula = '2n+0';
2989         if (formula == 'odd')  formula = '2n+1';
2990         if (mm = formula.match(/^(\d+)$/)) // digit only
2991           return '[' + fragment + "= " + mm[1] + ']';
2992         if (mm = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
2993           if (mm[1] == "-") mm[1] = -1;
2994           var a = mm[1] ? Number(mm[1]) : 1;
2995           var b = mm[2] ? Number(mm[2]) : 0;
2996           predicate = "[((#{fragment} - #{b}) mod #{a} = 0) and " +
2997           "((#{fragment} - #{b}) div #{a} >= 0)]";
2998           return new Template(predicate).evaluate({
2999             fragment: fragment, a: a, b: b });
3000         }
3001       }
3002     }
3003   },
3004
3005   criteria: {
3006     tagName:      'n = h.tagName(n, r, "#{1}", c);      c = false;',
3007     className:    'n = h.className(n, r, "#{1}", c);    c = false;',
3008     id:           'n = h.id(n, r, "#{1}", c);           c = false;',
3009     attrPresence: 'n = h.attrPresence(n, r, "#{1}", c); c = false;',
3010     attr: function(m) {
3011       m[3] = (m[5] || m[6]);
3012       return new Template('n = h.attr(n, r, "#{1}", "#{3}", "#{2}", c); c = false;').evaluate(m);
3013     },
3014     pseudo: function(m) {
3015       if (m[6]) m[6] = m[6].replace(/"/g, '\\"');
3016       return new Template('n = h.pseudo(n, "#{1}", "#{6}", r, c); c = false;').evaluate(m);
3017     },
3018     descendant:   'c = "descendant";',
3019     child:        'c = "child";',
3020     adjacent:     'c = "adjacent";',
3021     laterSibling: 'c = "laterSibling";'
3022   },
3023
3024   patterns: {
3025     // combinators must be listed first
3026     // (and descendant needs to be last combinator)
3027     laterSibling: /^\s*~\s*/,
3028     child:        /^\s*>\s*/,
3029     adjacent:     /^\s*\+\s*/,
3030     descendant:   /^\s/,
3031
3032     // selectors follow
3033     tagName:      /^\s*(\*|[\w\-]+)(\b|$)?/,
3034     id:           /^#([\w\-\*]+)(\b|$)/,
3035     className:    /^\.([\w\-\*]+)(\b|$)/,
3036     pseudo:
3037 /^:((first|last|nth|nth-last|only)(-child|-of-type)|empty|checked|(en|dis)abled|not)(\((.*?)\))?(\b|$|(?=\s|[:+~>]))/,
3038     attrPresence: /^\[((?:[\w]+:)?[\w]+)\]/,
3039     attr:         /\[((?:[\w-]*:)?[\w-]+)\s*(?:([!^$*~|]?=)\s*((['"])([^\4]*?)\4|([^'"][^\]]*?)))?\]/
3040   },
3041
3042   // for Selector.match and Element#match
3043   assertions: {
3044     tagName: function(element, matches) {
3045       return matches[1].toUpperCase() == element.tagName.toUpperCase();
3046     },
3047
3048     className: function(element, matches) {
3049       return Element.hasClassName(element, matches[1]);
3050     },
3051
3052     id: function(element, matches) {
3053       return element.id === matches[1];
3054     },
3055
3056     attrPresence: function(element, matches) {
3057       return Element.hasAttribute(element, matches[1]);
3058     },
3059
3060     attr: function(element, matches) {
3061       var nodeValue = Element.readAttribute(element, matches[1]);
3062       return nodeValue && Selector.operators[matches[2]](nodeValue, matches[5] || matches[6]);
3063     }
3064   },
3065
3066   handlers: {
3067     // UTILITY FUNCTIONS
3068     // joins two collections
3069     concat: function(a, b) {
3070       for (var i = 0, node; node = b[i]; i++)
3071         a.push(node);
3072       return a;
3073     },
3074
3075     // marks an array of nodes for counting
3076     mark: function(nodes) {
3077       var _true = Prototype.emptyFunction;
3078       for (var i = 0, node; node = nodes[i]; i++)
3079         node._countedByPrototype = _true;
3080       return nodes;
3081     },
3082
3083     unmark: function(nodes) {
3084       for (var i = 0, node; node = nodes[i]; i++)
3085         node._countedByPrototype = undefined;
3086       return nodes;
3087     },
3088
3089     // mark each child node with its position (for nth calls)
3090     // "ofType" flag indicates whether we're indexing for nth-of-type
3091     // rather than nth-child
3092     index: function(parentNode, reverse, ofType) {
3093       parentNode._countedByPrototype = Prototype.emptyFunction;
3094       if (reverse) {
3095         for (var nodes = parentNode.childNodes, i = nodes.length - 1, j = 1; i >= 0; i--) {
3096           var node = nodes[i];
3097           if (node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
3098         }
3099       } else {
3100         for (var i = 0, j = 1, nodes = parentNode.childNodes; node = nodes[i]; i++)
3101           if (node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
3102       }
3103     },
3104
3105     // filters out duplicates and extends all nodes
3106     unique: function(nodes) {
3107       if (nodes.length == 0) return nodes;
3108       var results = [], n;
3109       for (var i = 0, l = nodes.length; i < l; i++)
3110         if (!(n = nodes[i])._countedByPrototype) {
3111           n._countedByPrototype = Prototype.emptyFunction;
3112           results.push(Element.extend(n));
3113         }
3114       return Selector.handlers.unmark(results);
3115     },
3116
3117     // COMBINATOR FUNCTIONS
3118     descendant: function(nodes) {
3119       var h = Selector.handlers;
3120       for (var i = 0, results = [], node; node = nodes[i]; i++)
3121         h.concat(results, node.getElementsByTagName('*'));
3122       return results;
3123     },
3124
3125     child: function(nodes) {
3126       var h = Selector.handlers;
3127       for (var i = 0, results = [], node; node = nodes[i]; i++) {
3128         for (var j = 0, child; child = node.childNodes[j]; j++)
3129           if (child.nodeType == 1 && child.tagName != '!') results.push(child);
3130       }
3131       return results;
3132     },
3133
3134     adjacent: function(nodes) {
3135       for (var i = 0, results = [], node; node = nodes[i]; i++) {
3136         var next = this.nextElementSibling(node);
3137         if (next) results.push(next);
3138       }
3139       return results;
3140     },
3141
3142     laterSibling: function(nodes) {
3143       var h = Selector.handlers;
3144       for (var i = 0, results = [], node; node = nodes[i]; i++)
3145         h.concat(results, Element.nextSiblings(node));
3146       return results;
3147     },
3148
3149     nextElementSibling: function(node) {
3150       while (node = node.nextSibling)
3151         if (node.nodeType == 1) return node;
3152       return null;
3153     },
3154
3155     previousElementSibling: function(node) {
3156       while (node = node.previousSibling)
3157         if (node.nodeType == 1) return node;
3158       return null;
3159     },
3160
3161     // TOKEN FUNCTIONS
3162     tagName: function(nodes, root, tagName, combinator) {
3163       var uTagName = tagName.toUpperCase();
3164       var results = [], h = Selector.handlers;
3165       if (nodes) {
3166         if (combinator) {
3167           // fastlane for ordinary descendant combinators
3168           if (combinator == "descendant") {
3169             for (var i = 0, node; node = nodes[i]; i++)
3170               h.concat(results, node.getElementsByTagName(tagName));
3171             return results;
3172           } else nodes = this[combinator](nodes);
3173           if (tagName == "*") return nodes;
3174         }
3175         for (var i = 0, node; node = nodes[i]; i++)
3176           if (node.tagName.toUpperCase() === uTagName) results.push(node);
3177         return results;
3178       } else return root.getElementsByTagName(tagName);
3179     },
3180
3181     id: function(nodes, root, id, combinator) {
3182       var targetNode = $(id), h = Selector.handlers;
3183       if (!targetNode) return [];
3184       if (!nodes && root == document) return [targetNode];
3185       if (nodes) {
3186         if (combinator) {
3187           if (combinator == 'child') {
3188             for (var i = 0, node; node = nodes[i]; i++)
3189               if (targetNode.parentNode == node) return [targetNode];
3190           } else if (combinator == 'descendant') {
3191             for (var i = 0, node; node = nodes[i]; i++)
3192               if (Element.descendantOf(targetNode, node)) return [targetNode];
3193           } else if (combinator == 'adjacent') {
3194             for (var i = 0, node; node = nodes[i]; i++)
3195               if (Selector.handlers.previousElementSibling(targetNode) == node)
3196                 return [targetNode];
3197           } else nodes = h[combinator](nodes);
3198         }
3199         for (var i = 0, node; node = nodes[i]; i++)
3200           if (node == targetNode) return [targetNode];
3201         return [];
3202       }
3203       return (targetNode && Element.descendantOf(targetNode, root)) ? [targetNode] : [];
3204     },
3205
3206     className: function(nodes, root, className, combinator) {
3207       if (nodes && combinator) nodes = this[combinator](nodes);
3208       return Selector.handlers.byClassName(nodes, root, className);
3209     },
3210
3211     byClassName: function(nodes, root, className) {
3212       if (!nodes) nodes = Selector.handlers.descendant([root]);
3213       var needle = ' ' + className + ' ';
3214       for (var i = 0, results = [], node, nodeClassName; node = nodes[i]; i++) {
3215         nodeClassName = node.className;
3216         if (nodeClassName.length == 0) continue;
3217         if (nodeClassName == className || (' ' + nodeClassName + ' ').include(needle))
3218           results.push(node);
3219       }
3220       return results;
3221     },
3222
3223     attrPresence: function(nodes, root, attr, combinator) {
3224       if (!nodes) nodes = root.getElementsByTagName("*");
3225       if (nodes && combinator) nodes = this[combinator](nodes);
3226       var results = [];
3227       for (var i = 0, node; node = nodes[i]; i++)
3228         if (Element.hasAttribute(node, attr)) results.push(node);
3229       return results;
3230     },
3231
3232     attr: function(nodes, root, attr, value, operator, combinator) {
3233       if (!nodes) nodes = root.getElementsByTagName("*");
3234       if (nodes && combinator) nodes = this[combinator](nodes);
3235       var handler = Selector.operators[operator], results = [];
3236       for (var i = 0, node; node = nodes[i]; i++) {
3237         var nodeValue = Element.readAttribute(node, attr);
3238         if (nodeValue === null) continue;
3239         if (handler(nodeValue, value)) results.push(node);
3240       }
3241       return results;
3242     },
3243
3244     pseudo: function(nodes, name, value, root, combinator) {
3245       if (nodes && combinator) nodes = this[combinator](nodes);
3246       if (!nodes) nodes = root.getElementsByTagName("*");
3247       return Selector.pseudos[name](nodes, value, root);
3248     }
3249   },
3250
3251   pseudos: {
3252     'first-child': function(nodes, value, root) {
3253       for (var i = 0, results = [], node; node = nodes[i]; i++) {
3254         if (Selector.handlers.previousElementSibling(node)) continue;
3255           results.push(node);
3256       }
3257       return results;
3258     },
3259     'last-child': function(nodes, value, root) {
3260       for (var i = 0, results = [], node; node = nodes[i]; i++) {
3261         if (Selector.handlers.nextElementSibling(node)) continue;
3262           results.push(node);
3263       }
3264       return results;
3265     },
3266     'only-child': function(nodes, value, root) {
3267       var h = Selector.handlers;
3268       for (var i = 0, results = [], node; node = nodes[i]; i++)
3269         if (!h.previousElementSibling(node) && !h.nextElementSibling(node))
3270           results.push(node);
3271       return results;
3272     },
3273     'nth-child':        function(nodes, formula, root) {
3274       return Selector.pseudos.nth(nodes, formula, root);
3275     },
3276     'nth-last-child':   function(nodes, formula, root) {
3277       return Selector.pseudos.nth(nodes, formula, root, true);
3278     },
3279     'nth-of-type':      function(nodes, formula, root) {
3280       return Selector.pseudos.nth(nodes, formula, root, false, true);
3281     },
3282     'nth-last-of-type': function(nodes, formula, root) {
3283       return Selector.pseudos.nth(nodes, formula, root, true, true);
3284     },
3285     'first-of-type':    function(nodes, formula, root) {
3286       return Selector.pseudos.nth(nodes, "1", root, false, true);
3287     },
3288     'last-of-type':     function(nodes, formula, root) {
3289       return Selector.pseudos.nth(nodes, "1", root, true, true);
3290     },
3291     'only-of-type':     function(nodes, formula, root) {
3292       var p = Selector.pseudos;
3293       return p['last-of-type'](p['first-of-type'](nodes, formula, root), formula, root);
3294     },
3295
3296     // handles the an+b logic
3297     getIndices: function(a, b, total) {
3298       if (a == 0) return b > 0 ? [b] : [];
3299       return $R(1, total).inject([], function(memo, i) {
3300         if (0 == (i - b) % a && (i - b) / a >= 0) memo.push(i);
3301         return memo;
3302       });
3303     },
3304
3305     // handles nth(-last)-child, nth(-last)-of-type, and (first|last)-of-type
3306     nth: function(nodes, formula, root, reverse, ofType) {
3307       if (nodes.length == 0) return [];
3308       if (formula == 'even') formula = '2n+0';
3309       if (formula == 'odd')  formula = '2n+1';
3310       var h = Selector.handlers, results = [], indexed = [], m;
3311       h.mark(nodes);
3312       for (var i = 0, node; node = nodes[i]; i++) {
3313         if (!node.parentNode._countedByPrototype) {
3314           h.index(node.parentNode, reverse, ofType);
3315           indexed.push(node.parentNode);
3316         }
3317       }
3318       if (formula.match(/^\d+$/)) { // just a number
3319         formula = Number(formula);
3320         for (var i = 0, node; node = nodes[i]; i++)
3321           if (node.nodeIndex == formula) results.push(node);
3322       } else if (m = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
3323         if (m[1] == "-") m[1] = -1;
3324         var a = m[1] ? Number(m[1]) : 1;
3325         var b = m[2] ? Number(m[2]) : 0;
3326         var indices = Selector.pseudos.getIndices(a, b, nodes.length);
3327         for (var i = 0, node, l = indices.length; node = nodes[i]; i++) {
3328           for (var j = 0; j < l; j++)
3329             if (node.nodeIndex == indices[j]) results.push(node);
3330         }
3331       }
3332       h.unmark(nodes);
3333       h.unmark(indexed);
3334       return results;
3335     },
3336
3337     'empty': function(nodes, value, root) {
3338       for (var i = 0, results = [], node; node = nodes[i]; i++) {
3339         // IE treats comments as element nodes
3340         if (node.tagName == '!' || node.firstChild) continue;
3341         results.push(node);
3342       }
3343       return results;
3344     },
3345
3346     'not': function(nodes, selector, root) {
3347       var h = Selector.handlers, selectorType, m;
3348       var exclusions = new Selector(selector).findElements(root);
3349       h.mark(exclusions);
3350       for (var i = 0, results = [], node; node = nodes[i]; i++)
3351         if (!node._countedByPrototype) results.push(node);
3352       h.unmark(exclusions);
3353       return results;
3354     },
3355
3356     'enabled': function(nodes, value, root) {
3357       for (var i = 0, results = [], node; node = nodes[i]; i++)
3358         if (!node.disabled && (!node.type || node.type !== 'hidden'))
3359           results.push(node);
3360       return results;
3361     },
3362
3363     'disabled': function(nodes, value, root) {
3364       for (var i = 0, results = [], node; node = nodes[i]; i++)
3365         if (node.disabled) results.push(node);
3366       return results;
3367     },
3368
3369     'checked': function(nodes, value, root) {
3370       for (var i = 0, results = [], node; node = nodes[i]; i++)
3371         if (node.checked) results.push(node);
3372       return results;
3373     }
3374   },
3375
3376   operators: {
3377     '=':  function(nv, v) { return nv == v; },
3378     '!=': function(nv, v) { return nv != v; },
3379     '^=': function(nv, v) { return nv == v || nv && nv.startsWith(v); },
3380     '$=': function(nv, v) { return nv == v || nv && nv.endsWith(v); },
3381     '*=': function(nv, v) { return nv == v || nv && nv.include(v); },
3382     '$=': function(nv, v) { return nv.endsWith(v); },
3383     '*=': function(nv, v) { return nv.include(v); },
3384     '~=': function(nv, v) { return (' ' + nv + ' ').include(' ' + v + ' '); },
3385     '|=': function(nv, v) { return ('-' + (nv || "").toUpperCase() +
3386      '-').include('-' + (v || "").toUpperCase() + '-'); }
3387   },
3388
3389   split: function(expression) {
3390     var expressions = [];
3391     expression.scan(/(([\w#:.~>+()\s-]+|\*|\[.*?\])+)\s*(,|$)/, function(m) {
3392       expressions.push(m[1].strip());
3393     });
3394     return expressions;
3395   },
3396
3397   matchElements: function(elements, expression) {
3398     var matches = $$(expression), h = Selector.handlers;
3399     h.mark(matches);
3400     for (var i = 0, results = [], element; element = elements[i]; i++)
3401       if (element._countedByPrototype) results.push(element);
3402     h.unmark(matches);
3403     return results;
3404   },
3405
3406   findElement: function(elements, expression, index) {
3407     if (Object.isNumber(expression)) {
3408       index = expression; expression = false;
3409     }
3410     return Selector.matchElements(elements, expression || '*')[index || 0];
3411   },
3412
3413   findChildElements: function(element, expressions) {
3414     expressions = Selector.split(expressions.join(','));
3415     var results = [], h = Selector.handlers;
3416     for (var i = 0, l = expressions.length, selector; i < l; i++) {
3417       selector = new Selector(expressions[i].strip());
3418       h.concat(results, selector.findElements(element));
3419     }
3420     return (l > 1) ? h.unique(results) : results;
3421   }
3422 });
3423
3424 if (Prototype.Browser.IE) {
3425   Object.extend(Selector.handlers, {
3426     // IE returns comment nodes on getElementsByTagName("*").
3427     // Filter them out.
3428     concat: function(a, b) {
3429       for (var i = 0, node; node = b[i]; i++)
3430         if (node.tagName !== "!") a.push(node);
3431       return a;
3432     },
3433
3434     // IE improperly serializes _countedByPrototype in (inner|outer)HTML.
3435     unmark: function(nodes) {
3436       for (var i = 0, node; node = nodes[i]; i++)
3437         node.removeAttribute('_countedByPrototype');
3438       return nodes;
3439     }
3440   });
3441 }
3442
3443 function $$() {
3444   return Selector.findChildElements(document, $A(arguments));
3445 }
3446 var Form = {
3447   reset: function(form) {
3448     $(form).reset();
3449     return form;
3450   },
3451
3452   serializeElements: function(elements, options) {
3453     if (typeof options != 'object') options = { hash: !!options };
3454     else if (Object.isUndefined(options.hash)) options.hash = true;
3455     var key, value, submitted = false, submit = options.submit;
3456
3457     var data = elements.inject({ }, function(result, element) {
3458       if (!element.disabled && element.name) {
3459         key = element.name; value = $(element).getValue();
3460         if (value != null && element.type != 'file' && (element.type != 'submit' || (!submitted &&
3461             submit !== false && (!submit || key == submit) && (submitted = true)))) {
3462           if (key in result) {
3463             // a key is already present; construct an array of values
3464             if (!Object.isArray(result[key])) result[key] = [result[key]];
3465             result[key].push(value);
3466           }
3467           else result[key] = value;
3468         }
3469       }
3470       return result;
3471     });
3472
3473     return options.hash ? data : Object.toQueryString(data);
3474   }
3475 };
3476
3477 Form.Methods = {
3478   serialize: function(form, options) {
3479     return Form.serializeElements(Form.getElements(form), options);
3480   },
3481
3482   getElements: function(form) {
3483     return $A($(form).getElementsByTagName('*')).inject([],
3484       function(elements, child) {
3485         if (Form.Element.Serializers[child.tagName.toLowerCase()])
3486           elements.push(Element.extend(child));
3487         return elements;
3488       }
3489     );
3490   },
3491
3492   getInputs: function(form, typeName, name) {
3493     form = $(form);
3494     var inputs = form.getElementsByTagName('input');
3495
3496     if (!typeName && !name) return $A(inputs).map(Element.extend);
3497
3498     for (var i = 0, matchingInputs = [], length = inputs.length; i < length; i++) {
3499       var input = inputs[i];
3500       if ((typeName && input.type != typeName) || (name && input.name != name))
3501         continue;
3502       matchingInputs.push(Element.extend(input));
3503     }
3504
3505     return matchingInputs;
3506   },
3507
3508   disable: function(form) {
3509     form = $(form);
3510     Form.getElements(form).invoke('disable');
3511     return form;
3512   },
3513
3514   enable: function(form) {
3515     form = $(form);
3516     Form.getElements(form).invoke('enable');
3517     return form;
3518   },
3519
3520   findFirstElement: function(form) {
3521     var elements = $(form).getElements().findAll(function(element) {
3522       return 'hidden' != element.type && !element.disabled;
3523     });
3524     var firstByIndex = elements.findAll(function(element) {
3525       return element.hasAttribute('tabIndex') && element.tabIndex >= 0;
3526     }).sortBy(function(element) { return element.tabIndex }).first();
3527
3528     return firstByIndex ? firstByIndex : elements.find(function(element) {
3529       return ['input', 'select', 'textarea'].include(element.tagName.toLowerCase());
3530     });
3531   },
3532
3533   focusFirstElement: function(form) {
3534     form = $(form);
3535     form.findFirstElement().activate();
3536     return form;
3537   },
3538
3539   request: function(form, options) {
3540     form = $(form), options = Object.clone(options || { });
3541
3542     var params = options.parameters, action = form.readAttribute('action') || '';
3543     if (action.blank()) action = window.location.href;
3544     options.parameters = form.serialize(true);
3545
3546     if (params) {
3547       if (Object.isString(params)) params = params.toQueryParams();
3548       Object.extend(options.parameters, params);
3549     }
3550
3551     if (form.hasAttribute('method') && !options.method)
3552       options.method = form.method;
3553
3554     return new Ajax.Request(action, options);
3555   }
3556 };
3557
3558 /*--------------------------------------------------------------------------*/
3559
3560 Form.Element = {
3561   focus: function(element) {
3562     $(element).focus();
3563     return element;
3564   },
3565
3566   select: function(element) {
3567     $(element).select();
3568     return element;
3569   }
3570 };
3571
3572 Form.Element.Methods = {
3573   serialize: function(element) {
3574     element = $(element);
3575     if (!element.disabled && element.name) {
3576       var value = element.getValue();
3577       if (value != undefined) {
3578         var pair = { };
3579         pair[element.name] = value;
3580         return Object.toQueryString(pair);
3581       }
3582     }
3583     return '';
3584   },
3585
3586   getValue: function(element) {
3587     element = $(element);
3588     var method = element.tagName.toLowerCase();
3589     return Form.Element.Serializers[method](element);
3590   },
3591
3592   setValue: function(element, value) {
3593     element = $(element);
3594     var method = element.tagName.toLowerCase();
3595     Form.Element.Serializers[method](element, value);
3596     return element;
3597   },
3598
3599   clear: function(element) {
3600     $(element).value = '';
3601     return element;
3602   },
3603
3604   present: function(element) {
3605     return $(element).value != '';
3606   },
3607
3608   activate: function(element) {
3609     element = $(element);
3610     try {
3611       element.focus();
3612       if (element.select && (element.tagName.toLowerCase() != 'input' ||
3613           !['button', 'reset', 'submit'].include(element.type)))
3614         element.select();
3615     } catch (e) { }
3616     return element;
3617   },
3618
3619   disable: function(element) {
3620     element = $(element);
3621     element.disabled = true;
3622     return element;
3623   },
3624
3625   enable: function(element) {
3626     element = $(element);
3627     element.disabled = false;
3628     return element;
3629   }
3630 };
3631
3632 /*--------------------------------------------------------------------------*/
3633
3634 var Field = Form.Element;
3635 var $F = Form.Element.Methods.getValue;
3636
3637 /*--------------------------------------------------------------------------*/
3638
3639 Form.Element.Serializers = {
3640   input: function(element, value) {
3641     switch (element.type.toLowerCase()) {
3642       case 'checkbox':
3643       case 'radio':
3644         return Form.Element.Serializers.inputSelector(element, value);
3645       default:
3646         return Form.Element.Serializers.textarea(element, value);
3647     }
3648   },
3649
3650   inputSelector: function(element, value) {
3651     if (Object.isUndefined(value)) return element.checked ? element.value : null;
3652     else element.checked = !!value;
3653   },
3654
3655   textarea: function(element, value) {
3656     if (Object.isUndefined(value)) return element.value;
3657     else element.value = value;
3658   },
3659
3660   select: function(element, value) {
3661     if (Object.isUndefined(value))
3662       return this[element.type == 'select-one' ?
3663         'selectOne' : 'selectMany'](element);
3664     else {
3665       var opt, currentValue, single = !Object.isArray(value);
3666       for (var i = 0, length = element.length; i < length; i++) {
3667         opt = element.options[i];
3668         currentValue = this.optionValue(opt);
3669         if (single) {
3670           if (currentValue == value) {
3671             opt.selected = true;
3672             return;
3673           }
3674         }
3675         else opt.selected = value.include(currentValue);
3676       }
3677     }
3678   },
3679
3680   selectOne: function(element) {
3681     var index = element.selectedIndex;
3682     return index >= 0 ? this.optionValue(element.options[index]) : null;
3683   },
3684
3685   selectMany: function(element) {
3686     var values, length = element.length;
3687     if (!length) return null;
3688
3689     for (var i = 0, values = []; i < length; i++) {
3690       var opt = element.options[i];
3691       if (opt.selected) values.push(this.optionValue(opt));
3692     }
3693     return values;
3694   },
3695
3696   optionValue: function(opt) {
3697     // extend element because hasAttribute may not be native
3698     return Element.extend(opt).hasAttribute('value') ? opt.value : opt.text;
3699   }
3700 };
3701
3702 /*--------------------------------------------------------------------------*/
3703
3704 Abstract.TimedObserver = Class.create(PeriodicalExecuter, {
3705   initialize: function($super, element, frequency, callback) {
3706     $super(callback, frequency);
3707     this.element   = $(element);
3708     this.lastValue = this.getValue();
3709   },
3710
3711   execute: function() {
3712     var value = this.getValue();
3713     if (Object.isString(this.lastValue) && Object.isString(value) ?
3714         this.lastValue != value : String(this.lastValue) != String(value)) {
3715       this.callback(this.element, value);
3716       this.lastValue = value;
3717     }
3718   }
3719 });
3720
3721 Form.Element.Observer = Class.create(Abstract.TimedObserver, {
3722   getValue: function() {
3723     return Form.Element.getValue(this.element);
3724   }
3725 });
3726
3727 Form.Observer = Class.create(Abstract.TimedObserver, {
3728   getValue: function() {
3729     return Form.serialize(this.element);
3730   }
3731 });
3732
3733 /*--------------------------------------------------------------------------*/
3734
3735 Abstract.EventObserver = Class.create({
3736   initialize: function(element, callback) {
3737     this.element  = $(element);
3738     this.callback = callback;
3739
3740     this.lastValue = this.getValue();
3741     if (this.element.tagName.toLowerCase() == 'form')
3742       this.registerFormCallbacks();
3743     else
3744       this.registerCallback(this.element);
3745   },
3746
3747   onElementEvent: function() {
3748     var value = this.getValue();
3749     if (this.lastValue != value) {
3750       this.callback(this.element, value);
3751       this.lastValue = value;
3752     }
3753   },
3754
3755   registerFormCallbacks: function() {
3756     Form.getElements(this.element).each(this.registerCallback, this);
3757   },
3758
3759   registerCallback: function(element) {
3760     if (element.type) {
3761       switch (element.type.toLowerCase()) {
3762         case 'checkbox':
3763         case 'radio':
3764           Event.observe(element, 'click', this.onElementEvent.bind(this));
3765           break;
3766         default:
3767           Event.observe(element, 'change', this.onElementEvent.bind(this));
3768           break;
3769       }
3770     }
3771   }
3772 });
3773
3774 Form.Element.EventObserver = Class.create(Abstract.EventObserver, {
3775   getValue: function() {
3776     return Form.Element.getValue(this.element);
3777   }
3778 });
3779
3780 Form.EventObserver = Class.create(Abstract.EventObserver, {
3781   getValue: function() {
3782     return Form.serialize(this.element);
3783   }
3784 });
3785 if (!window.Event) var Event = { };
3786
3787 Object.extend(Event, {
3788   KEY_BACKSPACE: 8,
3789   KEY_TAB:       9,
3790   KEY_RETURN:   13,
3791   KEY_ESC:      27,
3792   KEY_LEFT:     37,
3793   KEY_UP:       38,
3794   KEY_RIGHT:    39,
3795   KEY_DOWN:     40,
3796   KEY_DELETE:   46,
3797   KEY_HOME:     36,
3798   KEY_END:      35,
3799   KEY_PAGEUP:   33,
3800   KEY_PAGEDOWN: 34,
3801   KEY_INSERT:   45,
3802
3803   cache: { },
3804
3805   relatedTarget: function(event) {
3806     var element;
3807     switch(event.type) {
3808       case 'mouseover': element = event.fromElement; break;
3809       case 'mouseout':  element = event.toElement;   break;
3810       default: return null;
3811     }
3812     return Element.extend(element);
3813   }
3814 });
3815
3816 Event.Methods = (function() {
3817   var isButton;
3818
3819   if (Prototype.Browser.IE) {
3820     var buttonMap = { 0: 1, 1: 4, 2: 2 };
3821     isButton = function(event, code) {
3822       return event.button == buttonMap[code];
3823     };
3824
3825   } else if (Prototype.Browser.WebKit) {
3826     isButton = function(event, code) {
3827       switch (code) {
3828         case 0: return event.which == 1 && !event.metaKey;
3829         case 1: return event.which == 1 && event.metaKey;
3830         default: return false;
3831       }
3832     };
3833
3834   } else {
3835     isButton = function(event, code) {
3836       return event.which ? (event.which === code + 1) : (event.button === code);
3837     };
3838   }
3839
3840   return {
3841     isLeftClick:   function(event) { return isButton(event, 0) },
3842     isMiddleClick: function(event) { return isButton(event, 1) },
3843     isRightClick:  function(event) { return isButton(event, 2) },
3844
3845     element: function(event) {
3846       event = Event.extend(event);
3847
3848       var node          = event.target,
3849           type          = event.type,
3850           currentTarget = event.currentTarget;
3851
3852       if (currentTarget && currentTarget.tagName) {
3853         // Firefox screws up the "click" event when moving between radio buttons
3854         // via arrow keys. It also screws up the "load" and "error" events on images,
3855         // reporting the document as the target instead of the original image.
3856         if (type === 'load' || type === 'error' ||
3857           (type === 'click' && currentTarget.tagName.toLowerCase() === 'input'
3858             && currentTarget.type === 'radio'))
3859               node = currentTarget;
3860       }
3861       if (node.nodeType == Node.TEXT_NODE) node = node.parentNode;
3862       return Element.extend(node);
3863     },
3864
3865     findElement: function(event, expression) {
3866       var element = Event.element(event);
3867       if (!expression) return element;
3868       var elements = [element].concat(element.ancestors());
3869       return Selector.findElement(elements, expression, 0);
3870     },
3871
3872     pointer: function(event) {
3873       var docElement = document.documentElement,
3874       body = document.body || { scrollLeft: 0, scrollTop: 0 };
3875       return {
3876         x: event.pageX || (event.clientX +
3877           (docElement.scrollLeft || body.scrollLeft) -
3878           (docElement.clientLeft || 0)),
3879         y: event.pageY || (event.clientY +
3880           (docElement.scrollTop || body.scrollTop) -
3881           (docElement.clientTop || 0))
3882       };
3883     },
3884
3885     pointerX: function(event) { return Event.pointer(event).x },
3886     pointerY: function(event) { return Event.pointer(event).y },
3887
3888     stop: function(event) {
3889       Event.extend(event);
3890       event.preventDefault();
3891       event.stopPropagation();
3892       event.stopped = true;
3893     }
3894   };
3895 })();
3896
3897 Event.extend = (function() {
3898   var methods = Object.keys(Event.Methods).inject({ }, function(m, name) {
3899     m[name] = Event.Methods[name].methodize();
3900     return m;
3901   });
3902
3903   if (Prototype.Browser.IE) {
3904     Object.extend(methods, {
3905       stopPropagation: function() { this.cancelBubble = true },
3906       preventDefault:  function() { this.returnValue = false },
3907       inspect: function() { return "[object Event]" }
3908     });
3909
3910     return function(event) {
3911       if (!event) return false;
3912       if (event._extendedByPrototype) return event;
3913
3914       event._extendedByPrototype = Prototype.emptyFunction;
3915       var pointer = Event.pointer(event);
3916       Object.extend(event, {
3917         target: event.srcElement,
3918         relatedTarget: Event.relatedTarget(event),
3919         pageX:  pointer.x,
3920         pageY:  pointer.y
3921       });
3922       return Object.extend(event, methods);
3923     };
3924
3925   } else {
3926     Event.prototype = Event.prototype || document.createEvent("HTMLEvents")['__proto__'];
3927     Object.extend(Event.prototype, methods);
3928     return Prototype.K;
3929   }
3930 })();
3931
3932 Object.extend(Event, (function() {
3933   var cache = Event.cache;
3934
3935   function getEventID(element) {
3936     if (element._prototypeEventID) return element._prototypeEventID[0];
3937     arguments.callee.id = arguments.callee.id || 1;
3938     return element._prototypeEventID = [++arguments.callee.id];
3939   }
3940
3941   function getDOMEventName(eventName) {
3942     if (eventName && eventName.include(':')) return "dataavailable";
3943     return eventName;
3944   }
3945
3946   function getCacheForID(id) {
3947     return cache[id] = cache[id] || { };
3948   }
3949
3950   function getWrappersForEventName(id, eventName) {
3951     var c = getCacheForID(id);
3952     return c[eventName] = c[eventName] || [];
3953   }
3954
3955   function createWrapper(element, eventName, handler) {
3956     var id = getEventID(element);
3957     var c = getWrappersForEventName(id, eventName);
3958     if (c.pluck("handler").include(handler)) return false;
3959
3960     var wrapper = function(event) {
3961       if (!Event || !Event.extend ||
3962         (event.eventName && event.eventName != eventName))
3963           return false;
3964
3965       Event.extend(event);
3966       handler.call(element, event);
3967     };
3968
3969     wrapper.handler = handler;
3970     c.push(wrapper);
3971     return wrapper;
3972   }
3973
3974   function findWrapper(id, eventName, handler) {
3975     var c = getWrappersForEventName(id, eventName);
3976     return c.find(function(wrapper) { return wrapper.handler == handler });
3977   }
3978
3979   function destroyWrapper(id, eventName, handler) {
3980     var c = getCacheForID(id);
3981     if (!c[eventName]) return false;
3982     c[eventName] = c[eventName].without(findWrapper(id, eventName, handler));
3983   }
3984
3985   function destroyCache() {
3986     for (var id in cache)
3987       for (var eventName in cache[id])
3988         cache[id][eventName] = null;
3989   }
3990
3991
3992   // Internet Explorer needs to remove event handlers on page unload
3993   // in order to avoid memory leaks.
3994   if (window.attachEvent) {
3995     window.attachEvent("onunload", destroyCache);
3996   }
3997
3998   // Safari has a dummy event handler on page unload so that it won't
3999   // use its bfcache. Safari <= 3.1 has an issue with restoring the "document"
4000   // object when page is returned to via the back button using its bfcache.
4001   if (Prototype.Browser.WebKit) {
4002     window.addEventListener('unload', Prototype.emptyFunction, false);
4003   }
4004
4005   return {
4006     observe: function(element, eventName, handler) {
4007       element = $(element);
4008       var name = getDOMEventName(eventName);
4009
4010       var wrapper = createWrapper(element, eventName, handler);
4011       if (!wrapper) return element;
4012
4013       if (element.addEventListener) {
4014         element.addEventListener(name, wrapper, false);
4015       } else {
4016         element.attachEvent("on" + name, wrapper);
4017       }
4018
4019       return element;
4020     },
4021
4022     stopObserving: function(element, eventName, handler) {
4023       element = $(element);
4024       var id = getEventID(element), name = getDOMEventName(eventName);
4025
4026       if (!handler && eventName) {
4027         getWrappersForEventName(id, eventName).each(function(wrapper) {
4028           element.stopObserving(eventName, wrapper.handler);
4029         });
4030         return element;
4031
4032       } else if (!eventName) {
4033         Object.keys(getCacheForID(id)).each(function(eventName) {
4034           element.stopObserving(eventName);
4035         });
4036         return element;
4037       }
4038
4039       var wrapper = findWrapper(id, eventName, handler);
4040       if (!wrapper) return element;
4041
4042       if (element.removeEventListener) {
4043         element.removeEventListener(name, wrapper, false);
4044       } else {
4045         element.detachEvent("on" + name, wrapper);
4046       }
4047
4048       destroyWrapper(id, eventName, handler);
4049
4050       return element;
4051     },
4052
4053     fire: function(element, eventName, memo) {
4054       element = $(element);
4055       if (element == document && document.createEvent && !element.dispatchEvent)
4056         element = document.documentElement;
4057
4058       var event;
4059       if (document.createEvent) {
4060         event = document.createEvent("HTMLEvents");
4061         event.initEvent("dataavailable", true, true);
4062       } else {
4063         event = document.createEventObject();
4064         event.eventType = "ondataavailable";
4065       }
4066
4067       event.eventName = eventName;
4068       event.memo = memo || { };
4069
4070       if (document.createEvent) {
4071         element.dispatchEvent(event);
4072       } else {
4073         element.fireEvent(event.eventType, event);
4074       }
4075
4076       return Event.extend(event);
4077     }
4078   };
4079 })());
4080
4081 Object.extend(Event, Event.Methods);
4082
4083 Element.addMethods({
4084   fire:          Event.fire,
4085   observe:       Event.observe,
4086   stopObserving: Event.stopObserving
4087 });
4088
4089 Object.extend(document, {
4090   fire:          Element.Methods.fire.methodize(),
4091   observe:       Element.Methods.observe.methodize(),
4092   stopObserving: Element.Methods.stopObserving.methodize(),
4093   loaded:        false
4094 });
4095
4096 (function() {
4097   /* Support for the DOMContentLoaded event is based on work by Dan Webb,
4098      Matthias Miller, Dean Edwards and John Resig. */
4099
4100   var timer;
4101
4102   function fireContentLoadedEvent() {
4103     if (document.loaded) return;
4104     if (timer) window.clearInterval(timer);
4105     document.fire("dom:loaded");
4106     document.loaded = true;
4107   }
4108
4109   if (document.addEventListener) {
4110     if (Prototype.Browser.WebKit) {
4111       timer = window.setInterval(function() {
4112         if (/loaded|complete/.test(document.readyState))
4113           fireContentLoadedEvent();
4114       }, 0);
4115
4116       Event.observe(window, "load", fireContentLoadedEvent);
4117
4118     } else {
4119       document.addEventListener("DOMContentLoaded",
4120         fireContentLoadedEvent, false);
4121     }
4122
4123   } else {
4124     document.write("<script id=__onDOMContentLoaded defer src=//:><\/script>");
4125     $("__onDOMContentLoaded").onreadystatechange = function() {
4126       if (this.readyState == "complete") {
4127         this.onreadystatechange = null;
4128         fireContentLoadedEvent();
4129       }
4130     };
4131   }
4132 })();
4133 /*------------------------------- DEPRECATED -------------------------------*/
4134
4135 Hash.toQueryString = Object.toQueryString;
4136
4137 var Toggle = { display: Element.toggle };
4138
4139 Element.Methods.childOf = Element.Methods.descendantOf;
4140
4141 var Insertion = {
4142   Before: function(element, content) {
4143     return Element.insert(element, {before:content});
4144   },
4145
4146   Top: function(element, content) {
4147     return Element.insert(element, {top:content});
4148   },
4149
4150   Bottom: function(element, content) {
4151     return Element.insert(element, {bottom:content});
4152   },
4153
4154   After: function(element, content) {
4155     return Element.insert(element, {after:content});
4156   }
4157 };
4158
4159 var $continue = new Error('"throw $continue" is deprecated, use "return" instead');
4160
4161 // This should be moved to script.aculo.us; notice the deprecated methods
4162 // further below, that map to the newer Element methods.
4163 var Position = {
4164   // set to true if needed, warning: firefox performance problems
4165   // NOT neeeded for page scrolling, only if draggable contained in
4166   // scrollable elements
4167   includeScrollOffsets: false,
4168
4169   // must be called before calling withinIncludingScrolloffset, every time the
4170   // page is scrolled
4171   prepare: function() {
4172     this.deltaX =  window.pageXOffset
4173                 || document.documentElement.scrollLeft
4174                 || document.body.scrollLeft
4175                 || 0;
4176     this.deltaY =  window.pageYOffset
4177                 || document.documentElement.scrollTop
4178                 || document.body.scrollTop
4179                 || 0;
4180   },
4181
4182   // caches x/y coordinate pair to use with overlap
4183   within: function(element, x, y) {
4184     if (this.includeScrollOffsets)
4185       return this.withinIncludingScrolloffsets(element, x, y);
4186     this.xcomp = x;
4187     this.ycomp = y;
4188     this.offset = Element.cumulativeOffset(element);
4189
4190     return (y >= this.offset[1] &&
4191             y <  this.offset[1] + element.offsetHeight &&
4192             x >= this.offset[0] &&
4193             x <  this.offset[0] + element.offsetWidth);
4194   },
4195
4196   withinIncludingScrolloffsets: function(element, x, y) {
4197     var offsetcache = Element.cumulativeScrollOffset(element);
4198
4199     this.xcomp = x + offsetcache[0] - this.deltaX;
4200     this.ycomp = y + offsetcache[1] - this.deltaY;
4201     this.offset = Element.cumulativeOffset(element);
4202
4203     return (this.ycomp >= this.offset[1] &&
4204             this.ycomp <  this.offset[1] + element.offsetHeight &&
4205             this.xcomp >= this.offset[0] &&
4206             this.xcomp <  this.offset[0] + element.offsetWidth);
4207   },
4208
4209   // within must be called directly before
4210   overlap: function(mode, element) {
4211     if (!mode) return 0;
4212     if (mode == 'vertical')
4213       return ((this.offset[1] + element.offsetHeight) - this.ycomp) /
4214         element.offsetHeight;
4215     if (mode == 'horizontal')
4216       return ((this.offset[0] + element.offsetWidth) - this.xcomp) /
4217         element.offsetWidth;
4218   },
4219
4220   // Deprecation layer -- use newer Element methods now (1.5.2).
4221
4222   cumulativeOffset: Element.Methods.cumulativeOffset,
4223
4224   positionedOffset: Element.Methods.positionedOffset,
4225
4226   absolutize: function(element) {
4227     Position.prepare();
4228     return Element.absolutize(element);
4229   },
4230
4231   relativize: function(element) {
4232     Position.prepare();
4233     return Element.relativize(element);
4234   },
4235
4236   realOffset: Element.Methods.cumulativeScrollOffset,
4237
4238   offsetParent: Element.Methods.getOffsetParent,
4239
4240   page: Element.Methods.viewportOffset,
4241
4242   clone: function(source, target, options) {
4243     options = options || { };
4244     return Element.clonePosition(target, source, options);
4245   }
4246 };
4247
4248 /*--------------------------------------------------------------------------*/
4249
4250 if (!document.getElementsByClassName) document.getElementsByClassName = function(instanceMethods){
4251   function iter(name) {
4252     return name.blank() ? null : "[contains(concat(' ', @class, ' '), ' " + name + " ')]";
4253   }
4254
4255   instanceMethods.getElementsByClassName = Prototype.BrowserFeatures.XPath ?
4256   function(element, className) {
4257     className = className.toString().strip();
4258     var cond = /\s/.test(className) ? $w(className).map(iter).join('') : iter(className);
4259     return cond ? document._getElementsByXPath('.//*' + cond, element) : [];
4260   } : function(element, className) {
4261     className = className.toString().strip();
4262     var elements = [], classNames = (/\s/.test(className) ? $w(className) : null);
4263     if (!classNames && !className) return elements;
4264
4265     var nodes = $(element).getElementsByTagName('*');
4266     className = ' ' + className + ' ';
4267
4268     for (var i = 0, child, cn; child = nodes[i]; i++) {
4269       if (child.className && (cn = ' ' + child.className + ' ') && (cn.include(className) ||
4270           (classNames && classNames.all(function(name) {
4271             return !name.toString().blank() && cn.include(' ' + name + ' ');
4272           }))))
4273         elements.push(Element.extend(child));
4274     }
4275     return elements;
4276   };
4277
4278   return function(className, parentElement) {
4279     return $(parentElement || document.body).getElementsByClassName(className);
4280   };
4281 }(Element.Methods);
4282
4283 /*--------------------------------------------------------------------------*/
4284
4285 Element.ClassNames = Class.create();
4286 Element.ClassNames.prototype = {
4287   initialize: function(element) {
4288     this.element = $(element);
4289   },
4290
4291   _each: function(iterator) {
4292     this.element.className.split(/\s+/).select(function(name) {
4293       return name.length > 0;
4294     })._each(iterator);
4295   },
4296
4297   set: function(className) {
4298     this.element.className = className;
4299   },
4300
4301   add: function(classNameToAdd) {
4302     if (this.include(classNameToAdd)) return;
4303     this.set($A(this).concat(classNameToAdd).join(' '));
4304   },
4305
4306   remove: function(classNameToRemove) {
4307     if (!this.include(classNameToRemove)) return;
4308     this.set($A(this).without(classNameToRemove).join(' '));
4309   },
4310
4311   toString: function() {
4312     return $A(this).join(' ');
4313   }
4314 };
4315
4316 Object.extend(Element.ClassNames.prototype, Enumerable);
4317
4318 /*--------------------------------------------------------------------------*/
4319
4320 Element.addMethods();