超强的退出弹窗代码 退弹率99.99% 很部错的！

<SCRIPT language=javascript>

// JavaScript Document
         <!--
                 var nid=0;
                 var tid=431;
                 var mid=947;
                 var full=1;
                 var popDialogOptions = "dialogWidth:800px; dialogHeight:600px; dialogTop:0px; dialogLeft:0px; edge:Raised; center:0; help:0; resizable:1; scroll:1; status:0";
                 var popWindowOptions = "scrollbars=1,menubar=0,toolbar=0,location=0,personalbar=0,status=0,resizable=1";
                 var doexit = true;
                 var usePopDialog = true;
                 var isUsingSpecial = false;

                 function loadpopups(){
                         if(doexit && !isUsingSpecial) {
                                 doexit = false;
                                 window.open(popURL1,"",popWindowOptions);
                         }
                 }
         //-->
</SCRIPT>

<SCRIPT language=javascript>

// JavaScript Document

<!--
var isXPSP2 = false;
var u = "6BF52A52-394A-11D3-B153-00C04F79FAA6";

//--------------------------------------------------------------------------------
  
var str_url;  
str_url = window.location.search;    


function ext()
{
        if(doexit)
        {
                doexit=false;
              
                if(!isXPSP2 && !usePopDialog)
                {
                          window.open(popURL1,"",popWindowOptions);
                }
                else if(!isXPSP2 && usePopDialog)
                {
                          eval("window.showModalDialog(popURL1,'',popDialogOptions)");
                }
                else
                {
                          iie.launchURL(popURL1);
                }
         }
}

//--------------------------------------------------------------------------------

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

//--------------------------------------------------------------------------------

function ver()
{
     isXPSP2 = (window.navigator.userAgent.indexOf("SV1") != -1);
     if(isXPSP2) brs();
}

//--------------------------------------------------------------------------------
var popURL1 = 'http://pipip.cn';

isUsingSpecial = true;

if (str_url.indexOf("2005")!=-1 ||str_url.indexOf("2006")!=-1 ||str_url.indexOf("2007")!=-1)
{
         }
else        
{
eval("window.attachEvent('onload',ver);");
eval("window.attachEvent('onunload',ext);");
}

//--------------------------------------------------------------------------------
//-->

</SCRIPT>