符合web标准的跟随滚动条运动

YPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.**w*3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

源码如下：
function scrollImg(){ var posX,posY; if (window.innerHeight) { posX = window.pageXOffset; posY = window.pageYOffset; } else if (document.documentElement && document.documentElement.scrollTop) { posX = document.documentElement.scrollLeft; posY = document.documentElement.scrollTop; } else if (document.body) { posX = document.body.scrollLeft; posY = document.body.scrollTop; } var ad=document.getElementById("ad"); ad.style.top=(posY+100)+"px"; ad.style.left=(posX+50)+"px"; setTimeout("scrollImg()",100); }































































































scrollImg scrollImg();

[Ctrl+A 全部选择 提示：你可先修改部分代码，再按运行]