Timeoutid=0;
Nohidenavigation=0;
mathnav="hidden";
litnav="hidden";
libnav="hidden";
linnav="hidden";
relnav="hidden";
schulnav="hidden";
kontnav="hidden";

function push_navs(){
 mathnav= document.getElementById("mathnav").style.visibility;
 litnav= document.getElementById("litnav").style.visibility;
 libnav= document.getElementById("libnav").style.visibility;
 linnav= document.getElementById("linnav").style.visibility;
 relnav= document.getElementById("relnav").style.visibility;
 schulnav= document.getElementById("schulnav").style.visibility;
 kontnav= document.getElementById("kontnav").style.visibility;
}

function pop_navs(){
 document.getElementById("mathnav").style.visibility=mathnav;
 document.getElementById("litnav").style.visibility=litnav;
 document.getElementById("libnav").style.visibility=libnav;
 document.getElementById("linnav").style.visibility=linnav;
 document.getElementById("relnav").style.visibility=relnav;
 document.getElementById("schulnav").style.visibility=schulnav;
 document.getElementById("kontnav").style.visibility=kontnav;
}

function show($element) {
 if (document.getElementById){
  document.getElementById("mathnav").style.visibility = "hidden";
  document.getElementById("litnav").style.visibility = "hidden";
  document.getElementById("libnav").style.visibility = "hidden";
  document.getElementById("linnav").style.visibility = "hidden";
  document.getElementById("relnav").style.visibility = "hidden";
  document.getElementById("schulnav").style.visibility = "hidden";
  document.getElementById("kontnav").style.visibility = "hidden";
  if (document.getElementById($element)){
   document.getElementById($element).style.visibility = "visible";
  }
  navistart();
 }
}

function navimodus($modus){
 if (document.getElementById){
  if ( $modus == "on" ) {
   document.getElementById("header").style.visibility = "visible";
   pop_navs();
   navistart();
  }else{
   push_navs();
   document.getElementById("header").style.visibility = "hidden";
   show("home");
  }
 }    
}

function navistart(){
 if (Nohidenavigation == 0){
  if (Timeoutid != 0){
   clearTimeout(Timeoutid);
  }
  Timeoutid=setTimeout('navimodus("off")',5000);
 }
}

function menuebutton(){
 document.write("<div align=right><a class=\"navlink\" href=\"\" onMouseOver=\"javascript:navimodus('on')\">Men&uuml;</a></div>");
}