function popup1() {
	var winl = (screen.width - 500) / 2;
	var wint = (screen.height - 500) / 2;
	window.open('contact.html','contact','toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no,width=500,height=500,screenY='+wint+',top='+wint+',left='+winl);
}