[task]<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>两侧广告条幅随窗口滚动</title>
<style type="text/css">
*{padding:0px;margin:0px;}
#ad,#ad1{background:#09F;}
</style>
</head>
<body >
<div id="ad" style="141px;height:218px;position:absolute;background:#09F;">
</div>
<div id="ad1" style="141px;height:218px;position:absolute;right:0px;background:#09F;">
</div>
<div id="time" style="background:#999; height:2000px;">
</div>
<script type="text/javascript">
var s=0;
function change(){
//alert(bodyScroll)
var bodyScroll=document.documentElement.scrollTop
h=Math.ceil(0.1*(bodyScroll-s));
s=h+s;
document.getElementById("ad").style.top=100+s+"px"
document.getElementById("ad1").style.top=100+s+"px"
}
function off(){
document.getElementById("ad").style.display="none";
}
function off1(){
document.getElementById("ad1").style.display="none";
}
setInterval("change()",10)
</script>
</body>
</html>
[/task]