/*浮动广告*/
.r1{width:150px;height:305px;background:red;float:right; text-align: center;color:#333333;font-size:12px;font-family:"宋体";
position:fixed !important; top/**/:200px; 
position:absolute; z-index:300; top:expression(offsetParent.scrollTop+200);right:50px;} 
.r2{width:150px;height:305px;background:red;float:right; text-align: center;color:#333333;font-size:12px;font-family:"宋体";
position:fixed !important; top/**/:300px; 
position:absolute; z-index:400; top:expression(offsetParent.scrollTop+300);right:50px;} 
.l1{width:150px;height:305px;background:red;float:right; 
position:fixed !important; top/**/:200px; text-align: center;color:#333333;font-size:12px;font-family:"宋体";
position:absolute; z-index:300; top:expression(offsetParent.scrollTop+200);left:50px;} 
.l2{width:150px;height:305px;background:red;float:right; 
position:fixed !important; top/**/:300px; text-align: center;color:#333333;font-size:12px;font-family:"宋体";
position:absolute; z-index:400; top:expression(offsetParent.scrollTop+300);left:50px;}