function setupRollovers(){
   $('boxynav').addClass('js_on');
   $$('#boxynav li span').each(function(img){
      img.onmouseover=function(){
         this.setOpacity(0.9);
      };
      img.onmouseout=function(){
         this.setOpacity(1);
      };
      img.onmousedown=function(){
         this.setOpacity(0.7);
      };


   });
}

window.addEvent('domready', setupRollovers);