var docLayers = null;
var startIndex = 0;

var lay1 = "unternehmen";

if (navigator.appName=='Netscape' && document.layers!=null)
{ docLayers = document.layers; }
else if(document.all)
{ docLayers = document.all; }


function toggle(whichLayer) {
if(docLayers){

	layer1 = docLayers['unternehmen'];
	layer2 = docLayers['dienstleistungen'];	
	layer3 = docLayers['produkte'];	
	layer4 = docLayers['plattformen'];
	layer5 = docLayers['referenzen'];
	layer6 = docLayers['downloads'];
	layer7 = docLayers['kontakt'];
	
    currentLayer = docLayers[whichLayer];
	
	if(document.all) {
		layer1.style.visibility = "hidden";
		layer2.style.visibility = "hidden";
		layer3.style.visibility = "hidden";
		layer4.style.visibility = "hidden";
		layer5.style.visibility = "hidden";
		layer6.style.visibility = "hidden";
		layer7.style.visibility = "hidden";
		if(whichLayer != "index.html"){
			currentLayer.style.visibility = (currentLayer.style.visibility=="visible") ? "hidden" : "visible";
		}
		}
	else {
		layer1.visibility = "hide";
		layer2.visibility = "hide";
		layer3.visibility = "hide";
		layer4.visibility = "hide";
		layer5.visibility = "hide";
		layer6.visibility = "hide";
		layer7.visibility = "hide";
		if(whichLayer != "index.html"){
		currentLayer.visibility = (currentLayer.visibility=="show") ? "hide" : "show";
		}
		}	
}
}