Ako sam dobro razumeo, samo ubaci jedan clearfix izmedju drugog i treceg reda...
Dakle:
HTML kôd:
<div style="width:600px;">
<div style='float:left;width:200px;height:60px;background:blue;'>
</div>
<div style='float:left;width:200px;height:70px;background:red;'>
</div>
<div style='float:left;width:200px;height:100px;background:green;'>
</div>
<div style='float:left;width:200px;height:100px;background:yellow;'>
</div>
<div style='float:left;width:200px;height:80px;background:silver;'>
</div>
<div style='float:left;width:200px;height:60px;background:black;'>
</div>
<div style="clear: both;"></div>
<div style='float:left;width:200px;height:60px;background:blue;'>
</div>
<div style='float:left;width:200px;height:70px;background:red;'>
</div>
<div style='float:left;width:200px;height:100px;background:green;'>
</div>
</div>