// Use it :

var Human = Kind.extend({
	toString : function() { console.log("hello : ", this); },
	initialize : function (name) {
		console.log("human constructor");
		this.name = name
	}
});

//Someone inherits of Human
var SomeOne = Human.extend({
	initialize : function(name){
		//call parent constructor
		SomeOne.__super__.initialize.call(this, name);
	}
});

var Bob = new Human("Bob");
Bob.toString();

var Sam = new SomeOne("Sam");
Sam.toString();