function popup(URL, w, h) {
	var winWidth	= w;
	var winHeight	= h;
	var winLeft		= (screen.width - winWidth) / 2;
	var winTop		= (screen.height - winHeight) / 2;
	window.open(URL, 'myWindow', 'toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=0,width='+winWidth+',height='+winHeight+',left='+winLeft+',top='+winTop);
}