You could also work some tables inside tables.

<table width='700'>

<tr><td width='200'>

<table bgcolor='blue'>
<tr><td>This is the Left Frame, it's Blue</td></tr>
</table>

</td><td>

<table>
<tr><td>This is the Right Frame, it's White</td></tr>
</table>

</td></tr>
</table>

Tables within Tables are good to use but can get confusing if you get too many.