#topintroleft{width:487px;height:318px;}
#topintromid{width:283px;height:318px;} 
#topintroright{width:150px;height:318px;} 

.floatl, #topintroright , #topintroleft, #topintromid{ float: left; z-index: 0;}
.clear{clear: both; font-size: 2px;}