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.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;} 

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