.r1{width:80px;height:80px;background:red;float:right; 
position:fixed !important; top/**/:200px; 
position:absolute; z-index:300; top:expression(offsetParent.scrollTop+200);right:20px;} 
.r2{width:80px;height:80px;background:red;float:right; 
position:fixed !important; top/**/:300px; 
position:absolute; z-index:400; top:expression(offsetParent.scrollTop+300);right:20px;} 
.l1{width:80px;height:80px;background:red;float:right; 
position:fixed !important; top/**/:200px; 
position:absolute; z-index:300; top:expression(offsetParent.scrollTop+200);left:20px;} 
.l2{width:80px;height:80px;background:red;float:right; 
position:fixed !important; top/**/:300px; 
position:absolute; z-index:400; top:expression(offsetParent.scrollTop+300);left:20px;}