Event.observe(window, 'load', function() {
	$$('.top_menu_button').each(function(obj){
		obj.onmouseover = function() { obj.fade({ duration: 0.2, from: 1, to: 0.7 }); }
		obj.onmouseout = function() { obj.fade({ duration: 0.2, from: 0.7, to: 1 }); }
	});
});