// JavaScript Document
adTime=30; //关闭窗口等待的时间 

chanceAd=1; 
var ns=(document.layers); 
var ie=(document.all); 
var w3=(document.getElementById && !ie); 
adCount=0; 
function initAd(){ 
if(!ns && !ie && !w3) return; 
if(ie) adDiv=eval('document.all.sponsorAdDiv.style'); 
else if(ns) adDiv=eval('document.layers["sponsorAdDiv"]'); 
else if(w3) adDiv=eval('document.getElementById("sponsorAdDiv").style'); 
randAd=Math.ceil(Math.random()*chanceAd); 
if (ie||w3) 
adDiv.visibility="visible"; 
else 
adDiv.visibility ="show"; 
if(randAd==1) showAd(); 
} 
function showAd(){ 
if(adCount<adTime*10){adCount+=1; 
if (ie){documentWidth =document.body.offsetWidth/2+document.body.scrollLeft-20; 
documentHeight =document.body.offsetHeight/2+document.body.scrollTop-20;} 
else if (ns){documentWidth=window.innerWidth/2+window.pageXOffset-20; 
documentHeight=window.innerHeight/2+window.pageYOffset-20;} 
else if (w3){documentWidth=self.innerWidth/2+window.pageXOffset-20; 
documentHeight=self.innerHeight/2+window.pageYOffset-20;} 
adDiv.left=documentWidth-400;adDiv.top =documentHeight-100; 
setTimeout("showAd()",100);}else closeAd(); 
} 
function closeAd(){ 
if (ie||w3) 
adDiv.display="none"; 
else 
adDiv.visibility ="hide"; 
} 
onload=initAd;