var version=0;
browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);
if (browserName == "Netscape" && browserVer >= 3) version = 1;
if (browserName == "Microsoft Internet Explorer" && browserVer >= 4) version = 2;
else version = 2;

var bup = new Array();
var bdn = new Array();
var i;

if (version >0) { for(i = 1; i <= b_anz; i++) {
  bup[i] = new Image(); bup[i].src = imgdir + "but" + i + "_up.gif";
  bdn[i] = new Image(); bdn[i].src = imgdir + "but" + i + "_dn.gif"; }
}

function xUp(Nr) {
  if (Nr>0 && Nr<=b_anz){
    if (version == 1 && Nr!=ActSel) document.eval("x" + Nr).src = eval("bup[" + Nr + "].src");
    if (version == 2 && Nr!=ActSel) eval("x" + Nr).src = eval("bup[" + Nr + "].src");
  }
  return true;
}

function xDn(Nr) {
  if (Nr>0 && Nr<=b_anz){
    if (version == 1 && Nr!=ActSel) document.eval("x" + Nr).src = eval("bdn[" + Nr + "].src");
    if (version == 2 && Nr!=ActSel) eval("x" + Nr).src = eval("bdn[" + Nr + "].src");
  }
  return true;
}

function show(Nr,URL1) {
  if (version >0 && Nr!=ActSel) {
    var OldSel = ActSel;
    xDn(Nr); ActSel=Nr; xUp(OldSel);
    parent.head.location.href="head_"+Nr+"u.htm";
    parent.menu1.location.href="om1.htm";
    parent.main.location.href=URL1; }
}

function openWin (url,mwidth,mheight) {
  var ExternalWin = window.open(url, "QUELLE" ,"scrollbars=1,width=" + mwidth  + ",height=" + mheight);
  if (version == 1) ExternalWin.focus();
}

function preselect() {
  if (ActSel > 0) {
  	var tempsel = ActSel;
  	ActSel=0;
	  xDn(tempsel,'');
	  ActSel=tempsel;
  }	
}