function setNavigation (element) {
  
      var opacityOff = 0.85;
      

      if (element) {
      	element.setStyle('opacity', opacityOff);		
      	element.addEvent('mouseenter', function(e) {
      		
          element.setStyle('opacity', 1);	
      		e.stop();
      	});
     	  element.addEvent('mouseleave', function(e) {
      		element.setStyle('opacity', opacityOff);	
      		e.stop();
      	});    	
      }   
  
  } 
	
	window.addEvent('domready', function() {	

      setNavigation($('qn1'));
      setNavigation($('qn2'));
      setNavigation($('qn3'));
      setNavigation($('qn4'));
           
  });