window.addEvent('load', function () {

  $$('#clevergyNavigation .nav').each(function(navPoint){
    navPoint.addEvent('mouseover', function() {
      // clear subnavs
      $$('#clevergyNavigation .subnav').each(function(navOff){
        navOff.getElements('img').each(function(navImg){ navImg.destroy(); });
        navOff.setStyle('display','none');
      });
      // select active subnav
      var sub = navPoint.getElement('.subnav');
      sub.setStyle('display','block');
      new Element('img', { 'src': '/images/relaunch2010/pfeil-ecke-oben.gif', 'class':'navArrow' }).inject(sub);
      sub.addEvent('mouseout', function() {
        sub.setStyle('display','none');
      });
    });
  });

});