var menus = new Array("nav_home","nav_person","nav_musizieren","nav_lehren","nav_presse","nav_termine","nav_kontakt","nav_gaestebuch");

audio_active = new Image();
audio_active.src="../pictures/audio_active.gif";

audio_inactive = new Image();
audio_inactive.src="../pictures/dummy.gif";

function show_only(divID)
{
   for (var i=0; i<menus.length; i++) {
     if (menus[i]==divID) {
       document.getElementById(menus[i]).style.display="block"; 
     } else {
       document.getElementById(menus[i]).style.display="none";
     }
   }
}

function hide_all(except) 
{
  for (var i=0; i<menus.length; i++)
    document.getElementById(menus[i]).style.display="none";
  document.getElementById('nav_'+except).style.display="block";
}

function activate_audio(ElementID)
{
   document.getElementById('a'+ElementID).src=audio_active.src;
}

function deactivate_audio(ElementID)
{
   document.getElementById('a'+ElementID).src=audio_inactive.src;
}