var ns=(document.layers);
var ie=(document.all);
var w3=(document.getElementById && !ie);
var calunit=ns? "" : "px"

function show_box_pop(id){
	if(!ns && !ie && !w3) return;
	if(ie)		adDiv=eval('document.all.'+id+'.style');
	else if(ns)	adDiv=eval('document.layers[id]');
	else if(w3)	adDiv=eval('document.getElementById(id).style');
	if (ie||w3)
		adDiv.visibility="visible";
	else
		adDiv.visibility ="show";
	if (ie){
		documentWidth  =truebody().offsetWidth/2+truebody().scrollLeft-20;
		documentHeight =truebody().offsetHeight/2+truebody().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-200+calunit;adDiv.top =documentHeight-200+calunit;
}

function close_box_pop(id){
	if(!ns && !ie && !w3) return;
	if(ie)		adDiv=eval('document.all.'+id+'.style');
	else if(ns)	adDiv=eval('document.layers[id]');
	else if(w3)	adDiv=eval('document.getElementById(id).style');
	if (ie||w3)
		adDiv.visibility="hidden";
	else
		adDiv.visibility ="hide";
}

function truebody(){
	return (document.compatMode && document.compatMode!="BackCompat")? document.documentElement : document.body
}