function popup(page, w, h){
	wind = window.open(page, '', 'width='+w+', height='+h+', resizable=0, scrollbars=0, menubar=0, status=0, location=0, toolbar=0');
	var screenW = screen.width;
	var screenH = screen.height;
	wind.moveTo((screenW/2)-(w/2), (screenH/2)-(h/2));
}