浮动在两边的条幅

<script language="JavaScript">
	function initAd() { 
	MoveLayer(); 
} 
function MoveLayer() { 
	var y = 80 ;
	var b=document.getElementById("AdLayer_right").style.top;
	var c=parseInt(b.split("px")[0])
	var diff = (document.documentElement.scrollTop + y - c)*0.40; 
	y = document.documentElement.scrollTop + y - diff; 
	document.getElementById("AdLayer_left").style.top = y+"px";
	document.getElementById("AdLayer_right").style.top = y+"px";
	setTimeout(function(){ 
		MoveLayer(); 
	}, 20); 
}
initAd();
</script>

 

<div id="AdLayer_left" style='position:absolute; width:81px; height:335px; z-index:2; left: 0px; top: 80px'><img src="图片地址" border="0"></div>
<div id="AdLayer_right" style='position:absolute; width:81px; height:335px; z-index:2; right: 0px; top: 80px'><img src="图片地址" border="0"></div>

 

支持IE6,7,8 和 FF,暂不支持Chrome