function Popup(){

   var left=(screen.width-650)/2;
   var intNbrVisit = readCookie("NbrVisit");
   var intNbrListing = readCookie("NbrListing");


   if (intNbrVisit==1) {
       window.open("popup.php", "","toolbar=no, location=no, directories=no, status=no, scrollbars=yes, resizable=no, copyhistory=no, menuBar=no, width=650px, height=600px, top=50px, left="+left);
   }else if (intNbrListing==1){
       window.open("popup_listing.php", "","toolbar=no, location=no, directories=no, status=no, scrollbars=yes, resizable=no, copyhistory=no, menuBar=no, width=650px, height=600px, top=50px, left="+left);
   }

}

function setCookie(nom, valeur){

	var argv=setCookie.arguments;
	var argc=setCookie.arguments.length;
	var expires=(argc > 2) ? argv[2] : null;
	var path=(argc > 3) ? argv[3] : null;
	var domain=(argc > 4) ? argv[4] : null;
	var secure=(argc > 5) ? argv[5] : false;
	
	document.cookie=nom+"="+escape(valeur)+
	((expires==null) ? "" : ("; expires="+expires.toGMTString()))+
	((path==null) ? "" : ("; path="+path))+
	((domain==null) ? "" : ("; domain="+domain))+
	((secure==true) ? "; secure" : "");
	
}

function getCookie(offset){

	var endstr=document.cookie.indexOf (";", offset);
	
	if (endstr==-1) endstr=document.cookie.length;
	return unescape(document.cookie.substring(offset, endstr));
	
}

function readCookie(nom){
	
	var arg=nom+"=";
	var alen=arg.length;
	var clen=document.cookie.length;
	var i=0;
	
	while (i<clen){
		var j=i+alen;
		if (document.cookie.substring(i, j)==arg) return getCookie(j);
		i=document.cookie.indexOf(" ",i)+1;
		if (i==0) break;

	}
	
	return null;
}