.left
{
    width:200px; 
    height:200px; 
    border:1px solid #CCCCCC; 
    margin-left:0px;
    margin-top:0px;
    float:left;
    position:relative;
    
}

.middle
{
    width:370px; 
    height:200px; 
    border-top:1px solid #CCCCCC; 
    border-bottom:1px solid #CCCCCC; 
    margin-left:200px;
    margin:0px auto;
    float:left;
    position:relative;
}

.right
{
    width:200px; 
    height:200px; 
    border:1px solid #CCCCCC; 
    margin-left:478px;
    margin:0px auto;
    float:left;
    position:relative;
}