源码网两侧漂浮。经测试,兼容IE6,IE7,Firefox浏览器。

CSS代码为:
.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;}

页面代码为: