Wrapping entire forum in table with 2 columns

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I'm trying to add a column to each side of my forum but I want to basically have the columns outside the forum display table. I want them to go all the way to the top on each side with the forum in the middle.

I'm trying to put a table around them, here is the code i'm trying but not having success with.

HEADER
<table border="0" align="left" cellpadding="0" cellspacing="2"><tr><td valign="top" width="150">
<img src="banner.jpg">
</td><td>



FOOTER
</td><td valign="top" width="150">
<img src="banner.jpg">
</td>

</tr></table>