adTime=5;  //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 - 466;
      adDiv.top = 100;//documentHeight - 150;
      setTimeout("showAd()", 100);
   }
   else closeAd();
}
function closeAd()
{
   if (ie || w3)
   adDiv.display = "none";
   else
   adDiv.visibility = "hide";
}
onload=initAd;