function login_popup(URL){
	leftPos = 0
	topPos = 0
	if (screen) {
	leftPos = (screen.width / 2) - 150
	topPos = (screen.height / 2) - 100
	}
	ElementWindow = window.open(URL,'','height=250,width=300,channelmode=0,dependent=0,directories=0,fullscreen=0,location=0,menubar=0,resizable=1,scrollbars=1,status=0,toolbar=0,left='+leftPos+',top='+topPos);
}