function displayZoom()
{
  if($('bild_zoom')!=null) 
  {
    $('zoom_indicator').setStyle('display', 'block');
    $('zoom_indicator').setStyle('color', '#000000');
    $('zoom_indicator').addEvents({'click': function(){switchImage();}, 'mouseover': function(){this.fade(1);}, 'mouseout': function(){if(!Browser.Engine.trident)this.fade(0.5);} });
    if(!Browser.Engine.trident) {$('zoom_indicator').fade(0.5);} else {$('zoom_indicator').fade(1);}
  }
}

function switchImage() 
{
   temp = $('bild').src;
   $('bild').src = $('bild_zoom').src;
   $('bild_zoom').src = temp;
}