function openWindow(sURL,sName,iWidth,iHeight) {
	window.self.open(sURL,sName,'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no,copyhistory=no,width=' + iWidth + ',height=' + iHeight);
}

var myWelcome = GetCookie("WELCOME");

if (myWelcome != "TRUE") {
	openWindow('welcome.asp','welcome','400','420');
}