.top{height:100px; background:#9CF 

}

.main{height:600px;background:red;}

.left{height:600px;width:200px;background:blue;position:absolute;left:0;top:100px;}

.right{height:600px;margin:0px 0px 0px   220px;background:green;}

.foot{height:70px;;background:#FF0080;clear:both;top:700px;}