تبدیل table به tableless در HTML

[alborzhost]

<style>
body{
margin:0px;    
}
div#main-body{
    width:980px;
    margin:0 auto;    
}
div.section{
    width:326px;
    min-height:100px;
    float:right;    
}
div.clear{
    clear:both;    
}

</style>


<div id="main-body">

<div class="section" style="width:652px;background-color:#C90">12</div>
<div class="section" style="background-color:#F60">3</div>
<div class="clear"></div>

<div class="section">4</div>
<div class="section">5</div>
<div class="section">6</div>

</div>