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Test Info:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Essai</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<script type="text/javascript" language="javascript">
function remove_col2() {
var colp = document.getElementById("colp");
var c4= document.getElementById("c4");
colp.colSpan=0;
colp.style.display="none";
c4.style.display="none";
}
function remove_col() {
var tr1 = document.getElementById("tr1");
var tr2 = document.getElementById("tr2");
var tr3 = document.getElementById("tr3");
var colp = document.getElementById("colp");
var c1 = document.getElementById("c1");
var c2 = document.getElementById("c2");
var c3 = document.getElementById("c3");
var c4= document.getElementById("c4");
c1.style.display="none";
colp.colSpan=1;
c3.style.display="none";
c2.style.display="none";
document.documentElement.offsetHeight;
remove_col2();
}
</script>
</head>
<body onload="remove_col()">
<table border="1" id="t_0">
<thead>
<tr id="tr1">
<th rowspan="2">aaaa</th>
<th rowspan="2">bbbb</th>
<th colspan="2" id ="colp">cccc</th>
<th rowspan="2">dddd</th>
</tr>
<tr id="tr2">
<th id="c1">eeee</th>
<th id="c2">ffff</th>
</tr>
</thead>
<tbody>
<tr id="tr3">
<td>1111</td>
<td>2222</td>
<td id="c3">3333</td>
<td id="c4">4444</td>
<td>5555</td>
</tr>
</tbody>
</table>
</body>
</html>