create x new.js

var Foo = {
    init: function(who) {
        this.me = who;
    },
    identify: function() {
        return "I am " + this.me;
    }
};

Foo.create = function() {
     return Object.create(this);   
}

var Bar = Foo.create();

Bar.speak = function() {
    alert("Hello, " + this.identify() + ".");
};

Bar.create = function(param) {
    var a = Object.create(this);        
    a.init(param);
    return a;
}

var b1 = Bar.create('b1');
var b2 = Bar.create('b2');

b1.speak(); // alerts: "Hello, I am b1."
b2.speak(); // alerts: "Hello, I am b2."