// JavaScript Document
	var Menu = {
		effect: '',
		
		over: function(element) {
			if (this.effect) this.effect.cancel();
			this.effect = new Effect.Opacity(
			 element, { 
					from: element.getOpacity(), 
					to: 0.8,
					duration: 0.3
			});
		},
		out: function(element) {
			if (this.effect) this.effect.cancel();
			this.effect =  new Effect.Opacity(
			 element, { 
					from: element.getOpacity(), 
					to: 0.5,
					duration: 0.3
			});
		},
		
		switchImg: function(testo) {
			$('top').innerHTML = testo;
		}
	}