var ns=(document.layers);
var ie=(document.all);
var w3=(document.getElementById && !ie);
function initPopup(){
        if(!ns && !ie && !w3){
                return;
        }
        if(ie){
                adDiv=eval('document.all.windlocation.style');
        }else if(ns){
                adDiv=eval('document.layers["windlocation"]');
        }else if(w3){
                adDiv=eval('document.getElementById("windlocation").style');
        }
        showPopup();
}
function showPopup(){
        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-250;
        adDiv.top =documentHeight-150;
}
function closePopup(){
        if (ie||w3){
                adDiv.display="none";
        }else{
                adDiv.display="";
        }
}