Possible Duplicate:
CSS - Equal Height Columns?
I'm not the greatest with css, so my page layout looks like this:
<div style="width:80%;border:1px solid #000;">
<div style="float:left; width:33.3%; background:#aaa;">one</div>
<div style="float:left; width:33.3%; background:#bbb;">two</div>
<div style="float:left; width:33.4%; background:#ccc;">three</div>
<div style="clear:both;"></div>
</div>
div one has the side links and image
div two holds the main content
div tree has some ads div
now when the main content increases in size the other two stay the same height, so how do I get the height for all 3 divs to increase??