<span id=test1>
<table>
<tr><td>asdff</td></tr>
<tr><td>asdff</td></tr>
<tr><td>asdff</td></tr>
<tr><td>asdff</td></tr>
</table>
</span>
<script>
HtmStr = "<table><tr><td>asdff</td></tr></table>";
alert(HtmStr);
document.all['test1'].innerHTML=HtmStr;
alert(document.all['test1'].innerHTML);
</script>
<table>
<tr><td>asdff</td></tr>
<tr><td>asdff</td></tr>
<tr><td>asdff</td></tr>
<tr><td>asdff</td></tr>
</table>
</span>
<script>
HtmStr = "<table><tr><td>asdff</td></tr></table>";
alert(HtmStr);
document.all['test1'].innerHTML=HtmStr;
alert(document.all['test1'].innerHTML);
</script>
http://msdn.microsoft.com/workshop/author/tables/buildtables.asp