4 <script type=
"text/javascript">
8 var tbody
= document
.getElementById("tbody");
9 var trX
= document
.createElement('tr');
10 tbody
.insertBefore(trX
, tbody
.getElementsByTagName("tr")[0]);
11 var trY
= document
.createElement('tr');
12 tbody
.insertBefore(trY
, trX
);
13 var tdY1
= document
.createElement('td');
14 tdY1
.setAttribute('rowspan', 0);
15 trY
.appendChild(tdY1
);
19 td {width:
30px; height:
30px;}
24 <body onload=
"boom();">
25 <table border
cellspacing=
"10px" cellpadding=
"10px">