var TimerId;
    var FirstLevel = 'x';
    var SecondLevel = 'x';
    var ThirdLevel = 'x';
    var FourthLevel;

    function setNavLevel(Lev1,Lev2,Lev3)
    {
      FirstLevel = Lev1;
      SecondLevel = Lev2;
      ThirdLevel = Lev3;      
    }
    
    function hideNavLevel(Lev1ID,Lev2ID,Lev3ID)
    {
      timerfunction = function(lev1,lev2,lev3)
      {
        if(lev1 != 'x')
        {
            var dingen = document.getElementById(lev1);
            dingen.style.visibility = 'hidden';
        }
        if(lev2 != 'x')
        {
          var dingen = document.getElementById(lev2);
          dingen.style.visibility = 'hidden';
        }
        if(lev3 != 'x')
        {
          var dingen = document.getElementById(lev3);
          dingen.style.visibility = 'hidden';
        }
      }
      TimerId = window.setTimeout("timerfunction('" + Lev1ID + "','" + Lev2ID + "','" + Lev3ID + "')",800);
    }
    
    function showNavLevel(Lev1,Lev2,Lev3)
    {
      clearTimeout(TimerId);
        if(document.getElementById) 
        { 
        if(FirstLevel != 'x')
        {
          document.getElementById(FirstLevel).style.visibility = 'hidden';
          FirstLevel = 'x';
        }
        if(Lev1 != 'x')
        {
          document.getElementById(Lev1).style.visibility = 'visible';
          FirstLevel = Lev1;
        }
        
        if(SecondLevel != 'x')
        {
          document.getElementById(SecondLevel).style.visibility = 'hidden';
          SecondLevel = 'x';
        }
        if(Lev2 != 'x')
        {
          document.getElementById(Lev2).style.visibility = 'visible';
          SecondLevel = Lev2;
        }
        
        if(ThirdLevel != 'x')
        {
          document.getElementById(ThirdLevel).style.visibility = 'hidden';
          ThirdLevel = 'x';
        }
        if(Lev3 != 'x')
        {
          document.getElementById(Lev3).style.visibility = 'visible';
          ThirdLevel = Lev3;
        }
      }
    }


// Zeichenzaehler ------------------------------------------------------------------------------
    var meldung='Der eingegebene Text ueberschreitet die 1500 Zeichen Grenze.';
    var maximale_laenge=900;

    function zeichen_ausrechnen ()
    { 
	  window.document.aussteller_kuendigen_an.aussteller_kuendigen_an.value = window.document.aussteller_kuendigen_an.presse.value.length;
    }

    function laengen_check () 
    {
      if (window.document.aussteller_kuendigen_an.presse.value.length > maximale_laenge) 
      {
	    alert (meldung);
        window.document.aussteller_kuendigen_an.presse.focus();
        return false;
      } 
      else 
      {
	    return true;
      }
    }