// JavaScript Document
var Animal = new Class({
	getMilk: function(){}
});

var Living = new Class({
	live: function(){}	,
	talk: function(){ return null; }				   
})

var Cow = Animal.extend({
	talk: function(){ return "moo"; }				
})

Cow.implement(new Living); //cow lives. needs "live" method"

Cow.talk(); //null... not moo...