window.onload = function() {
	
	$$('a.navbutton').each(function(el) {
	    
  		el.addEvent('mouseover', function(){this.effect('opacity', {duration:50, wait:0}).custom(1,0.3)});
  		el.addEvent('mouseout', function(){this.effect('opacity', {duration:50, wait:0}).custom(0.3,1);});
	});
	
	

};