window.addEvent('domready', function() {
		
			$$('.menu_item').each(function(a){
					
					var myFx = new Fx.Tween(a);
//Immediately sets the background color of the element to red:
          myFx.set('background-color', '#ffffff');

					
							a.addEvents({
          		mouseover: function(){           
										this.set('tween', {
												duration: 2000,
												transition: Fx.Transitions.Quart.easeOut
                  			}).tween('background-color', '#d0e8b0');
          		},
							
							mouseleave: function(){           
										 this.set('tween', {
												transition: Fx.Transitions.Quart.easeOut
                  			}).tween('background-color', '#FFFFFF');
          		}
          
          	});
										 
      });
		

});