if (document.images) {
  		var img_leistung1 = new Image();
 		img_leistung1.src = "images/button/nav1.gif";
		var img_leistung2 = new Image();
 		img_leistung2.src = "images/button/nav12.gif";

  		var img_friedmann1 = new Image();
 		img_friedmann1.src = "images/button/nav2.gif";
		var img_friedmann2 = new Image();
 		img_friedmann2.src = "images/button/nav22.gif";
 		
 		var img_rotherham1 = new Image();
 		img_rotherham1.src = "images/button/nav3.gif";
		var img_rotherham2 = new Image();
 		img_rotherham2.src = "images/button/nav32.gif";
 		
 		var img_kontakt1 = new Image();
 		img_kontakt1.src = "images/button/nav4.gif";
		var img_kontakt2 = new Image();
 		img_kontakt2.src = "images/button/nav42.gif";
 		
 		var img_weg1 = new Image();
 		img_weg1.src = "images/button/nav5.gif";
		var img_weg2 = new Image();
 		img_weg2.src = "images/button/nav52.gif";
		
		}
		function leistung1() {
		if (document.images)
		document.images["leistung"].src = "images/button/nav1.gif";
		}
		function leistung2() {
		if (document.images)
		document.images["leistung"].src = "images/button/nav12.gif";
		}

		function friedmann1() {
		if (document.images)
		document.images["friedmann"].src = "images/button/nav2.gif";
		}
		function friedmann2() {
		if (document.images)
		document.images["friedmann"].src = "images/button/nav22.gif";
		}
		
		function rotherham1() {
		if (document.images)
		document.images["rotherham"].src = "images/button/nav3.gif";
		}
		function rotherham2() {
		if (document.images)
		document.images["rotherham"].src = "images/button/nav32.gif";
		}
		
		function kontakt1() {
		if (document.images)
		document.images["kontakt"].src = "images/button/nav4.gif";
		}
		function kontakt2() {
		if (document.images)
		document.images["kontakt"].src = "images/button/nav42.gif";
		}
		
		function weg1() {
		if (document.images)
		document.images["weg"].src = "images/button/nav5.gif";
		}
		function weg2() {
		if (document.images)
		document.images["weg"].src = "images/button/nav52.gif";
		}