不用js多浏览器兼容纯DIV/CSS对联漂浮广告代码

.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;} 

<div class="r1"><a href="https://www.VeVB.COm" target='_about'><img src="/js/pic/piao-l-1.gif" width="80" height="80" border="0" /></a></div>   
<div class="r2"><a href="https://www.VeVB.COm" target='_about'><img src="/js/pic/piao-l-1.gif" width="80" height="80" border="0" /></a></div>   
<div class="l1"><a href="https://www.VeVB.COm" target='_about'><img src="/js/pic/piao-l-1.gif" width="80" height="80" border="0" /></a></div>   
<div class="l2"><a href="https://www.VeVB.COm" target='_about'><img src="/js/pic/piao-l-1.gif" width="80" height="80" border="0" /></a></div>