[JsConAp]

nerv_,
ну ок

function Animal(name) {
    this._name = name;
}
Animal.prototype.getName = function () {
    return this._name;
};

function Cow(name) {
    Animal.apply(this, arguments);
    this.moo = function () {
        return "Cow " + this.getName() + " says moo";
    };
}

Cow.prototype = Object.create(Animal.prototype);
Cow.prototype.constructor = Cow;

var cow = new Cow("Milka");

alert(cow instanceof Animal);