如何实现图片随着窗口的上下滚动而上下滚动？

<html>
<head><title>在网页中停留的图片广告</title>
</head>
<body>
<SCRIPT language=javascript>
<!--
document.ns = navigator.appName == "Netscape"
window.screen.width>800 ? imgheight=110:imgheight=110
window.screen.width>800 ? imgleft=110:imgleft=110
function qingzuiload()
{
if (navigator.appName == "Netscape")
{document.qingzui.pageY=pageYOffset+window.innerHeight-imgheight;
document.qingzui.pageX=pageXOffset+window.innerWidth-imgleft;
qingzuimove();
}
else
{
qingzui.style.top=document.body.scrollTop+document.body.offsetHeight-imgheight;
qingzui.style.left=document.body.offsetWidth-imgleft;
qingzui2.style.top=document.body.scrollTop+document.body.offsetHeight-imgheight-80;
qingzui2.style.left=document.body.offsetWidth-imgleft;
qingzuimove();
}
}
function qingzuimove()
{
if(document.ns)
{
document.qingzui.top=pageYOffset+window.innerHeight-imgheight
document.qingzui.left=pageXOffset+window.innerWidth-imgleft;
setTimeout("qingzuimove();",80)
}
else
{
qingzui.style.top=document.body.scrollTop+document.body.offsetHeight-imgheight;
qingzui.style.left=document.body.offsetWidth-imgleft;
qingzui2.style.top=document.body.scrollTop+document.body.offsetHeight-imgheight-80;
qingzui2.style.left=document.body.offsetWidth-imgleft;
setTimeout("qingzuimove();",80)
}
}function MM_reloadPage(init) { //reloads the window if Nav4 resized
if (init==true) with (navigator) {if ((appName=="Netscape")&&(parseInt(appVersion)==4)) {
document.MM_pgW=innerWidth; document.MM_pgH=innerHeight; onresize=MM_reloadPage; }}
else if (innerWidth!=document.MM_pgW || innerHeight!=document.MM_pgH) location.reload();
}
MM_reloadPage(true)if (navigator.appName == "Netscape")
{document.write("<layer id=qingzui top=300 width=64 height=80><a href=javascript:AddToShoppingCart(-1)><img src=/shoppingcart/img/car.gif border=0></a></layer>")
qingzuiload()}
else
{
document.write("<div id=qingzui style='position: absolute;width:64;top:300;hidden: visible;z-index: 1'><a href=javascript:AddToShoppingCart(-1)><img src=/shoppingcart/img/car.gif border=0></a></div>"
+"<div id=qingzui2 style='position: absolute;visibility: hidden;z-index: 10'><img src=/shoppingcart/img/car.gif></div>");
qingzuiload()
}
//-->
</SCRIPT>
</body>
</html>
把这一句<img src=/shoppingcart/img/car.gif border=0>中的shoppingcart/img/car.gif改成你要指向的图片所在的路径，就可以了。