var clicked = null;
		browserName = navigator.appName;
		browserVer = parseInt(navigator.appVersion);
		if (browserVer >= 3) version = "n3";
		else version = "n2";
     	if (version == "n3") {

/*Bilddefinition Menüleiste */
	/*Hauptmenüleiste */
		/*first*/ 
			bild1off = new Image();
			bild1off.src = "../images/buttons/service_leistung_off.gif";
			bild1on = new Image();
			bild1on.src = "../images/buttons/service_leistung_on.gif";

		/*second*/
			bild2off = new Image();
			bild2off.src = "../images/buttons/ersatzteile_off.gif";
			bild2on = new Image();
			bild2on.src = "../images/buttons/ersatzteile_on.gif";


		/*third*/
			bild3off = new Image();
			bild3off.src = "../images/buttons/leihwagen_off.gif";
			bild3on = new Image();
			bild3on.src = "../images/buttons/leihwagen_on.gif";


		/*fourth*/
			bild4off = new Image();
			bild4off.src = "../images/buttons/tuning_off.gif";
			bild4on = new Image();
			bild4on.src = "../images/buttons/tuning_on.gif";

		/*fifth*/
			bild5off = new Image();
			bild5off.src = "../images/buttons/anfahrt_off.gif";
			bild5on = new Image();
			bild5on.src = "../images/buttons/anfahrt_on.gif";

		}

	function img_act(imgName,value) {
		if (version == "n3") {
		if(clicked == imgName) return;
		imgOn = eval(imgName + "on.src");
		document.images[value].src = imgOn;
			}
		}

	function img_inact(imgName,value) {
		if (version == "n3") {
		if(clicked == imgName) return;
		imgOff = eval(imgName + "off.src");
		document.images[value].src = imgOff;
			}
		}

	function img_clicked(imgName,value) {
		if (version == "n3") {
			if(clicked != null && clicked != imgName) {
				imgOff = eval(clicked + "off.src");
				document.images[index].src = imgOff;
			}
			clicked = imgName;
			index = value;
		}
		return true;
	}