function popup(URL, width, height){
	if (typeof width == 'undefined' ) width = 650;
	if (typeof height == 'undefined' ) height = 500;
	window.open(URL, 'popup', 'toolbar=0,scrollbars=1,location=0,statusbar=0,menubar=0,resizable=0,width='+width+',height='+height);
}