var isNav = false;
var DOM = false;
var isIE = false;
var homeon = true;






function init() {
		if (navigator.appName.indexOf("Netscape") != -1) {
		if (parseInt(navigator.appVersion) < 5) {
		isNav = true;
		} 
		else DOM = true
}
		if (navigator.appName.indexOf("Microsoft") != -1) {
			isIE = true;
		}
	
	}
	

function menuon(bildname,bilddatei,menu) {
allout();
if (isIE){
top.menu.document.all[""+bildname+""].src= "../images/navi/"+bilddatei+"_e.gif" 
top.menu.document.all[""+menu+""].style.visibility="visible";
}
	
if (isNav) {
top.menu.document.images[""+bildname+""].src= "../images/navi/"+bilddatei+"_e.gif"
top.menu.document.layers[""+menu+""].visibility="show";
}

if (DOM) {
top.menu.document.images[""+bildname+""].src= "../images/navi/"+bilddatei+"_e.gif"
top.menu.document.getElementById(""+menu+"").style.visibility="visible";
}
}

function allout() {
top.menu.document.menu1.src= "../images/navi/titel_portrait_e.gif" 
top.menu.document.menu2.src= "../images/navi/titel_partner_e.gif" 
top.menu.document.menu3.src= "../images/navi/titel_produkte_e.gif" 
top.menu.document.menu4.src= "../images/navi/titel_marktinfos_e.gif" 
top.menu.document.menu5.src= "../images/navi/titel_kontakt_e.gif" 

if (isIE){
top.menu.document.all["menupor"].style.visibility="hidden";
top.menu.document.all["menupart"].style.visibility="hidden";
top.menu.document.all["menuprod"].style.visibility="hidden";
top.menu.document.all["menuinfo"].style.visibility="hidden";
top.menu.document.all["menukont"].style.visibility="hidden";

}
	
if (isNav) {

top.menu.document.layers["menupor"].visibility="hide";
top.menu.document.layers["menupart"].visibility="hide";
top.menu.document.layers["menuprod"].visibility="hide";
top.menu.document.layers["menuinfo"].visibility="hide";
top.menu.document.layers["menukont"].visibility="hide";

}

if (DOM) {

top.menu.document.getElementById("menupor").style.visibility="hidden";
top.menu.document.getElementById("menupart").style.visibility="hidden";
top.menu.document.getElementById("menuprod").style.visibility="hidden";
top.menu.document.getElementById("menuinfo").style.visibility="hidden";
top.menu.document.getElementById("menukont").style.visibility="hidden";

}
}