when creating a 3column css layout, you need to have the main "center" section declared first in the html. Then apply the left float to the section that will be on the left and a right float that will be on the right. The last thing is to create a width for each side column, then create left and right margins on the main content and voila you shall have a standards compliant, best practices, seo 3 column website.
Code:
<div id="container">
<div id="top_area">
top
</div>
<div id="middle_area">
middle middle middle middle middle middle middle middle middle middle middle middle middle middle middle middle middle middle middle middle
</div>
<div id="left_column">
left
</div>
<div id="right_column">
right
</div>
<div id="bottom_area">
footer stuff
</div>
</div>
Visit http://matthewjamestaylor.com/blog/perfect-3-column.htm for a great article about 3column css layouts
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