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<HEAD>
<SCRIPT src=tableDom.js>
</SCRIPT>
<SCRIPT>
function doIt() {
var table = document.getElementsByTagName("TABLE")[0];
var refCg = document.getElementsByTagName("COLGROUP")[1];
var cg = document.createElement("COLGROUP", null);
var col = document.createElement("COL", null);
col.width = 100;
cg.appendChild(col);
col = document.createElement("COL", null);
col.width = 150;
cg.appendChild(col);
table.insertBefore(cg, refCg);
}
</SCRIPT>
</HEAD>
<BODY onload="doIt()">
<table bgcolor=orange border>
<colgroup>
<col width=50>
</colgroup>
<colgroup>
<col width=200>
</colgroup>
<tr>
<td>50</td><td>100</td><td>150</td><td>200</td>
</tr>
</table>
</BODY></HTML>
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