// sichtbarer Layer
var activeLayer = '';
function init() {
  activeLayer = '';
}
// Layer ein/ausschalten Funktion
function maus_layer(ebene) {
// fuer Netscape
 if (document.layers) {
	if (activeLayer != '')
		self.document.layers[activeLayer].visibility = 'hide';
 	if (activeLayer != ebene) 
		self.document.layers[ebene].visibility = 'show';
 }
 // fuer Internet Explorer
 else if (document.all) {
 	if (activeLayer != '')
		self.document.all[activeLayer].style.visibility = 'hidden';
 	if (activeLayer != ebene)
		self.document.all[ebene].style.visibility = 'visible';
 }
 // fuer Mozillanasen :)
 else if (document.getElementById) {
	if (activeLayer != '')
		self.document.getElementById(activeLayer).style.visibility = 'hidden';
 	if (activeLayer != ebene) 
		self.document.getElementById(ebene).style.visibility = 'visible';
 }
 activeLayer = (activeLayer == ebene) ? '' : ebene;
}

// Framevariante maus_layer
// fuer Netscape
function maus_layer_frame(ebene) {
 if (document.layers) {
	if (activeLayer != '')
		parent.fotos.document.layers[activeLayer].visibility = 'hide';
 	if (activeLayer != ebene) 
		parent.fotos.document.layers[ebene].visibility = 'show';
 }
 // fuer Internet Explorer
 else if (document.all) {
 	if (activeLayer != '')
		parent.fotos.document.all[activeLayer].style.visibility = 'hidden';
 	if (activeLayer != ebene)
		parent.fotos.document.all[ebene].style.visibility = 'visible';
 }
 // fuer Mozillanasen :)
 else if (document.getElementById) {
	if (activeLayer != '')
		parent.fotos.document.getElementById(activeLayer).style.visibility = 'hidden';
 	if (activeLayer != ebene) 
		parent.fotos.document.getElementById(ebene).style.visibility = 'visible';
 }
 activeLayer = (activeLayer == ebene) ? '' : ebene;
}