function init() {
		if (document.images) {
			a01a = new Image(145,53);
			a01a.src = "/pics/ba/hausruwa.gif";
			a01b = new Image(145,53);
			a01b.src = "/pics/bb/hausruwa.gif";
		
			a02a = new Image(145,53);
			a02a.src = "/pics/ba/innen.gif";
			a02b = new Image(145,53);
			a02b.src = "/pics/bb/innen.gif";
			
			a03a = new Image(145,53);
			a03a.src = "/pics/ba/shopping.gif";
			a03b = new Image(145,53);
			a03b.src = "/pics/bb/shopping.gif";
			
			a04a = new Image(145,53);
			a04a.src = "/pics/ba/anfahrt.gif";
			a04b = new Image(145,53);
			a04b.src = "/pics/bb/anfahrt.gif";
			
			a05a = new Image(145,53);
			a05a.src = "/pics/ba/kontakt.gif";
			a05b = new Image(145,53);
			a05b.src = "/pics/bb/kontakt.gif";
		}
	}

	function on(imgName) {
		if (document.images) {
			document [imgName].src = eval(imgName + "b.src");
		}
	}

	function off(imgName) {
		if (document.images) {
			document [imgName].src = eval(imgName + "a.src");
		}
	}