支持IE6、7、Firefox并符合W3C标准的对联广告JS代码

经测，此JS对联广告代码支持IE6、7、Firefox、Opera等主流浏览器，且符合W3C标准。

一、准备好JS和图片文件

1、下载此图片：　放到该放的地方。

2、把以下代码保存为 ad.js

JavaScript代码

var lastScrollY=0;
function heartBeat(){
var diffY;
if (document.documentElement && document.documentElement.scrollTop)
diffY = document.documentElement.scrollTop;
else if (document.body)
diffY = document.body.scrollTop
else
{/*Netscape stuff*/}
percent=.1*(diffY-lastScrollY);
if(percent>0)percent=Math.ceil(percent);
else percent=Math.floor(percent);
document.getElementById("adleft").style.top=parseInt(document.getElementById("adleft").style.top)+percent+"px";
document.getElementById("adright").style.top=parseInt(document.getElementById("adright").style.top)+percent+"px";
lastScrollY=lastScrollY+percent;
}
function adhide(names){document.getElementById(names).style.display='none';}
function screencl(names){if(screen.width<=800){adhide(names);}}
zcode="<div id='adleft' style='left:10px;position: absolute;z-index:1;top:100px;'><div style='width:100px;height:300px;background:#ccc;border:#999 solid 1px;'>左联</div><div align='right' style='background:#fff;font-size:0px;'>　<img src='images/close.gif' title='关闭' onclick=adhide('adleft') style='cursor:pointer'></div></div>";
ycode="<div id='adright' style='right:10px;position: absolute;z-index:1;top:100px;'><div style='width:100px;height:300px;background:#ccc;border:#999 solid 1px;'>右联</div><div align='left' style='background:#fff;font-size:0px;'>　<img src='images/close.gif' title='关闭' onclick=adhide('adright') style='cursor:pointer'></div></div>";
document.write(zcode);
document.write(ycode);
screencl('adleft');
screencl('adright');
window.setInterval("heartBeat()",1);