Mi sapreste dire cosa mi sfugge? In pixels la dimensione funziona, in percentuale no.
<body> <table border='2'>
<tr style="height: 20%;">
<td width='50%'>
<!-- Logo -->
logo
</td>
<td rowspan='2'>
content
</td>
</tr>
<tr style="height: 80%;">
<td>
<!-- Menu -->
menu
</td>
</tr>
</table>
</body>