Example:
http://www.expire.biz/test.html
Code:
<div style="width:500px">
<div style="float:left;width:100px;">content</div>
<div style="float:left;width:100px;">content</div>
<div style="float:left;width:100px;">content</div>
<div style="clear:both"></div>
<div style="float:left;width:100px;">content</div>
<div style="float:left;width:100px;">content</div>
<div style="float:left;width:100px;">content</div>
<div style="clear:both"></div>
<div style="float:left;width:100px;">content</div>
<div style="float:left;width:100px;">content</div>
<div style="float:left;width:100px;">content</div>
<div style="clear:both"></div>
</div>