if (document.images) {
  		var img_wann1 = new Image();
 		img_wann1.src = "images/button/wann1.jpg";
		var img_wann2 = new Image();
 		img_wann2.src = "images/button/wann2.jpg";
 		
 		var img_wir1 = new Image();
 		img_wir1.src = "images/button/wir1.jpg";
		var img_wir2 = new Image();
 		img_wir2.src = "images/button/wir2.jpg";
 		
 		var img_news1 = new Image();
 		img_news1.src = "images/button/news1.jpg";
		var img_news2 = new Image();
 		img_news2.src = "images/button/news2.jpg";
 		
 		var img_kontakt1 = new Image();
 		img_kontakt1.src = "images/button/kontakt1.jpg";
		var img_kontakt2 = new Image();
 		img_kontakt2.src = "images/button/kontakt2.jpg";
		
		}
		function wann1() {
		if (document.images)
		document.images["wann"].src = "images/button/wann1.jpg";
		}
		function wann2() {
		if (document.images)
		document.images["wann"].src = "images/button/wann2.jpg";
		}

		function wir1() {
		if (document.images)
		document.images["wir"].src = "images/button/wir1.jpg";
		}
		function wir2() {
		if (document.images)
		document.images["wir"].src = "images/button/wir2.jpg";
		}
		
		function news1() {
		if (document.images)
		document.images["news"].src = "images/button/news1.jpg";
		}
		function news2() {
		if (document.images)
		document.images["news"].src = "images/button/news2.jpg";
		}
		
		function kontakt1() {
		if (document.images)
		document.images["kontakt"].src = "images/button/kontakt1.jpg";
		}
		function kontakt2() {
		if (document.images)
		document.images["kontakt"].src = "images/button/kontakt2.jpg";
		}