[Filip]

Ako sam dobro razumeo, samo ubaci jedan clearfix izmedju drugog i treceg reda...

Dakle:

<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>