// Create a new Person object with dummy constructor
var Person = Class.create();

// Copy the following functions into the Person prototype
Object.extend( Person.prototype, {

    // The function called immediately by the Person constructor
    initialize: function( name ) {
        this.name = name;
    },

    // A simple function for the Person object
    getName: function() {
        return this.name;
    }

});

// Create a new User object with a dummy constructor
var User = Class.create();

// The User object inherits all the functions of its parent class
User.prototype = Object.extend( new Person(), {

    // Overwrite the old initialize function with the new one
    initialize: function( name, password ) {
        this.name = name;
        this.password = password;
    },

    // and add a new function to the object
    getPassword: function() {
        return this.password;
    }

});