function lib_bwcheck(){ //Browsercheck (needed)
this.ver=navigator.appVersion
this.agent=navigator.userAgent
this.dom=document.getElementById?1:0
this.opera5=this.agent.indexOf("Opera 5")>-1
this.ie5=(this.ver.indexOf("MSIE 5")>-1 && this.dom && !this.opera5)?1:0; 
this.ie6=(this.ver.indexOf("MSIE 6")>-1 && this.dom && !this.opera5)?1:0;
this.ie4=(document.all && !this.dom && !this.opera5)?1:0;
this.ie=this.ie4||this.ie5||this.ie6
this.mac=this.agent.indexOf("Mac")>-1
this.ns6=(this.dom && parseInt(this.ver) >= 5) ?1:0; 
this.ns4=(document.layers && !this.dom)?1:0;
this.bw=(this.ie6 || this.ie5 || this.ie4 || this.ns4 || this.ns6 || this.opera5)
return this
}
var bw=new lib_bwcheck()


function set_image(name, url){
var img = document.images[name];
if(img){
  img.src = url;
}
}

function showlayer(name) {
  if(bw.ns6)
    document.getElementById(name).style.visibility = "visible";
  else if(bw.ns4)
    document[name].visibility = "show";
  else if(bw.ie)
    eval('document.all["'+name+'"].style.visibility = "visible"');
}

function hidelayer(name) {
  if(bw.ns6)
    document.getElementById(name).style.visibility = "hidden";
  else if(bw.ns4)
    document[name].visibility = "hide";
  else if(bw.ie)
    document.all[name].style.visibility = "hidden";
}


// Bildwechsel für die Bilderleiste. Layer wechseln

var i = '1';
var test = "block";

function zeigeTextNr(ebene_nr){

		hidelayer(eval('"' + test + i +'"'));
		showlayer(eval('"' + test + ebene_nr +'"'));
    i = ebene_nr;
}

function js_show(pUrl) {
	if (bw.ns4)
		document.layers["bildserie"].document.images["bildwechsel"].src = pUrl;
else if (bw.ns6)
		document["bildwechsel"].src = pUrl;
else if(bw.ie)
		document.all["bildwechsel"].src = pUrl;
}

var x ='';
var aktnr='11';

function bild(x){
	aktnr = x;
	js_show('bilder/'+aktnr+'.jpg');
	zeigeTextNr(x);
}