var vLoaded = 0;
var ns = document.layers;
var ie = document.all;
var w3c = document.documentElement;
var b = new Array(24); 

for (i=1; i<25; i++) { 
  b[i]=new Image(); 
  b[i].src="images/nav_"+i+".gif";    <!-----test -->
}

if(ns) {
 	   layerRef="document.layers[";
       styleSwitch="]";
	   
       } 
	else if(w3c) {
	   layerRef="document.getElementById(";
	   styleSwitch=").style";
	   } 
	else if(ie) {
       layerRef="document.all(";
       styleSwitch=").style";
	   }

actLname = "";
altIname = "";
altnr = "";

function ShL(rub, nr) {
        if (vLoaded) {
                if (actLname != "") eval(layerRef+'"'+actLname+'"'+styleSwitch+'.visibility="hidden"');
				//if (altIname != "") document.images[altIname].src=b[altnr].src;
                actLname = "ams_" + rub;
				altIname = rub;
				altnr = nr-1;
                eval(layerRef+'"'+actLname+'"'+styleSwitch+'.visibility="visible"');
				//document.images[rub].src=b[nr].src;
        }
}

function initSite() {
        vLoaded = 1;
}
function ansage() {
alert ('Diese Funktion ist noch nicht implementiert.')
}
function ansage_schueler() {
alert ('In Kürze werden hier Fotos der einzelnen Klassen zu sehen sein.')
}