function Popup(url, winname, width, height, message) {
if (message != "") height+= 115;
width+= 40;
leftVal = (screen.width - width) / 2;
topVal = (screen.height - height) / 2;
winref = window.open(url,winname,'width=' + width + ',height=' + height + ',resizable=no,scrollbars=no,toolbar=no,location=no,directories=no,status=no,menubar=no,left='+leftVal+',top='+topVal);
if (url == "") {
top.winref.document.writeln('' + message + '');
}
return false;
}