I know you've resolved your problem but if you were to go down a CSS route in the future the following should work just fine.
Code:
<style type="text/css">
#content_main {clear:both;width:100%;min-width:900px;}
#main_left_container {width:80%;float:left;}
#main_right_content {width:20%;float:right;}
</style>
<div id="content_main">
<div id="main_left_container">
<div id="main_left_content">
[left content goes here]
<div>
</div>
<div id="main_right_container">
<div id="main_right_content">
[right content goes here]
</div>
</div>
</div>
It depends on what you intend to create within the two columns. In my personal opinion the CSS route provides greater flexibility.
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