Possible Duplicate:
Stacking Divs with CSS
Im kinda new to CSS have been using tables for my html for years, Im trying to figure out how I can nest divs or stack them inside the content section of a 3 column layout. with tables I'd just do a new TR but if I float another div into the content line line it will appear parallel or vertically to content, instead of under it. is there another way to do this or am I missing the point of Divs here?
<div id="header">Header</div>
<div id="leftcolumn">Left Column</div>
<div id="content">Content</div>
<div id="footer">Footer</div>