extend/Inheritance and bind method created by CS

bind.js

__bind = function(fn, me){ 
  return function(){ 
    return fn.apply(me, arguments); 
  }; 
}

extend.js

__hasProp = Object.prototype.hasOwnProperty;

__extends = function(child, parent) { 
    for (var key in parent) { 
        if (__hasProp.call(parent, key)) 
            child[key] = parent[key]; 
    } 

    function ctor() { 
        this.constructor = child; 
    } 

    ctor.prototype = parent.prototype; 

    child.prototype = new ctor(); 

    child.__super__ = parent.prototype; 

    return child; 
};