<table border="1" width="100%" height="100%">
<tr height="20%"><td colspan="2">top</td></tr>
<tr height="80%">
<td width="20%">
<a href="index.htm" target="main">index.html</a>
</td>
<td width="80%">
<iframe name="main" width="100%" height="100%"/>
</td></tr>
</table>
