var openlayers = 'none';

window.onerror = null;


if (navigator.appName == "Netscape") {
        layerStyleRef="layer.";
        layerRef="document.layers";
        styleSwitch="";
}else{
        layerStyleRef="layer.style.";
        layerRef="document.all";
        styleSwitch=".style";
}

        
function zeige (layer_name) {
  { 

	if (openlayers != 'none')
        verstecke (openlayers);

        eval(layerRef+'["'+layer_name+'"]'+styleSwitch+'.visibility="visible"');
		// Dummy anzeigen, damit aktiv
        eval(layerRef+'.dummyunten'+styleSwitch+'.visibility="visible"');
		
        openlayers = layer_name;
  }
}


function verstecke (layer_name) {
  {
        eval(layerRef+'["'+layer_name+'"]'+styleSwitch+'.visibility="hidden"');
        openlayers = 'none';
  }
}

// fuer Hauptbereichs-Seiten
function weg() {
	eval(layerRef+'["akm1"]'+styleSwitch+'.visibility="hidden"');
	eval(layerRef+'["akm2"]'+styleSwitch+'.visibility="hidden"');
	eval(layerRef+'["akm3"]'+styleSwitch+'.visibility="hidden"');
	eval(layerRef+'["akm4"]'+styleSwitch+'.visibility="hidden"');
	eval(layerRef+'["akm5"]'+styleSwitch+'.visibility="hidden"');
	eval(layerRef+'["akm6"]'+styleSwitch+'.visibility="hidden"');
	eval(layerRef+'["akm7"]'+styleSwitch+'.visibility="hidden"');
	// Dummy wieder weg

    eval(layerRef+'.dummyunten'+styleSwitch+'.visibility="hidden"');
	openlayers = 'none';
}

// fuer Unterseiten Link 1
function weg1() {
	eval(layerRef+'["akm1"]'+styleSwitch+'.visibility="visible"');
	eval(layerRef+'["akm2"]'+styleSwitch+'.visibility="hidden"');
	eval(layerRef+'["akm3"]'+styleSwitch+'.visibility="hidden"');
	eval(layerRef+'["akm4"]'+styleSwitch+'.visibility="hidden"');
	eval(layerRef+'["akm5"]'+styleSwitch+'.visibility="hidden"');
	eval(layerRef+'["akm6"]'+styleSwitch+'.visibility="hidden"');
	eval(layerRef+'["akm7"]'+styleSwitch+'.visibility="hidden"');
	// Dummy wieder weg

    eval(layerRef+'.dummyunten'+styleSwitch+'.visibility="hidden"');
	openlayers = 'none';
}

// fuer Unterseiten Link 2
function weg2() {
	eval(layerRef+'["akm1"]'+styleSwitch+'.visibility="hidden"');
	eval(layerRef+'["akm2"]'+styleSwitch+'.visibility="visible"');
	eval(layerRef+'["akm3"]'+styleSwitch+'.visibility="hidden"');
	eval(layerRef+'["akm4"]'+styleSwitch+'.visibility="hidden"');
	eval(layerRef+'["akm5"]'+styleSwitch+'.visibility="hidden"');
	eval(layerRef+'["akm6"]'+styleSwitch+'.visibility="hidden"');
	eval(layerRef+'["akm7"]'+styleSwitch+'.visibility="hidden"');
	// Dummy wieder weg

    eval(layerRef+'.dummyunten'+styleSwitch+'.visibility="hidden"');
	openlayers = 'none';
}

// fuer Unterseiten Link 5
function weg5() {
	eval(layerRef+'["akm1"]'+styleSwitch+'.visibility="hidden"');
	eval(layerRef+'["akm2"]'+styleSwitch+'.visibility="hidden"');
	eval(layerRef+'["akm3"]'+styleSwitch+'.visibility="hidden"');
	eval(layerRef+'["akm4"]'+styleSwitch+'.visibility="hidden"');
	eval(layerRef+'["akm5"]'+styleSwitch+'.visibility="visible"');
	eval(layerRef+'["akm6"]'+styleSwitch+'.visibility="hidden"');
	eval(layerRef+'["akm7"]'+styleSwitch+'.visibility="hidden"');
	// Dummy wieder weg

    eval(layerRef+'.dummyunten'+styleSwitch+'.visibility="hidden"');
	openlayers = 'none';
}