var tueranimation = false;
var tuer_offen = false;

function tuer_oeffnen(){
  
  if (tueranimation || tuer_offen)
    return false;
  tuer_offen = true;
  
  new Effect.Move('tuer_rechts', {
    x: 460,
    y: 0,
    mode: 'relative',
    duration: 2.0,
    beforeStart: function(){
      tueranimation = true; 
    }
  });
  
  new Effect.Move('tuer_links', {
    x: -460,
    y: 0,
    mode: 'relative',
    duration: 2.0
  });
  
  new Effect.Appear('hauptnavigation', {
    duration: 2,
    delay: 0.2,
    afterFinish: function(){
      tueranimation = false;
      document.getElementById('tueren').style.display = "none";
    }
  } );
  
  return false;
}

function tuer_schliessen(){
  
  if (tueranimation || !tuer_offen)
    return false;
  tuer_offen = false;
  
  document.getElementById('tueren').style.display = "block";
  
  new Effect.Fade('hauptnavigation', {
    duration: 2,
    beforeStart: function(){
      tueranimation = true; 
    }
  } );
  
  new Effect.Move('tuer_rechts', {
    x: -460,
    y: 0,
    mode: 'relative',
    duration: 2.0,
    delay: 0.2
  });
  
  new Effect.Move('tuer_links', {
    x: 460,
    y: 0,
    mode: 'relative',
    duration: 2.0,
    delay: 0.2,
    afterFinish: function(){
      tueranimation = false; 
    }
  });
  
  return false;
}