function setImg( sender ) {
	var num = sender.id.substr(3,1);
	var newimg = '/images/screenshots/qu-screenshot-' + num + '.jpg'
	
	if ($('screen-selected').src != newimg) {
		$('screen-selected').src = newimg;
		$('screen-selected').title = sender.title;
		$('screen-selected').alt = sender.alt;
		}
	}