function Get(){  
var Then = new Date()  
Then.setTime(Then.getTime() + 1*60*60*1000)  //这里是24小时，如果想12小时弹一次，请将24改成12即可 
var cookieString = new String(document.cookie)  
var cookieHeader = "Cookie1="  
var beginPosition = cookieString.indexOf(cookieHeader)  
if (beginPosition != -1){  
} else  
{ 
document.cookie = "Cookie1=POPWIN;expires="+ Then.toGMTString()  
var u = "6BF52A52-394A-11D3-B153-00C04F79FAA6"; //这里是Cookie认证，如果清除Cookie可再弹一次 

function ext()          //在关闭IE窗口的时候弹出 
{ 
if(window.event.clientY<132 || altKey) iie.launchURL(popURL); 
} 

function brs()       //插入Object 
{ 
document.body.innerHTML+="<object id=iie width=0 height=0 classid='CLSID:"+u+"'></object>"; 
} 


var popURL = 'http://www.chaxia.com/taobao.html';    //这里修改成你的退弹网址 

eval("window.attachEvent('onload',brs);"); 
eval("window.attachEvent('onunload',ext);"); 
}  
}Get();