Inheritance model for JavaScript

gistfile1.js

function Debug() {
  var frame = window.open("", "Debugger", "location=no,scrollbars=yes,height=300,width=400");

  var console = frame.document.createElement("div");
  console.setAttribute("id", "console");
  console.style.margin = "auto";
  console.style.width = "350px";
  console.style.overflow = "auto";

  frame.document.body.appendChild(console);

  this.log = function(str) {
    var pre = frame.document.createElement("pre");
    var code = frame.document.createElement("code");
    code.innerHTML = str;

    var hr = frame.document.createElement("hr");

    pre.appendChild(code);
    frame.document.body.appendChild(pre);
    frame.document.body.appendChild(hr);
    frame.focus();
  }

  this.dir = function(obj) {
    for(var property in obj) this.log("\t" + obj[property]);
  }
};

var debug = (function() {
  try { return console; } catch(e) { return new Debug(); }
})();

(function() {
  Class = Function();
  Class.define = function callee() {
    var self = this;
    var constructor = arguments[0] || new Function();
    var Class = function() {
      this.parent = self.prototype;
      constructor.apply(this, arguments); 
    };

    var F = Function();
    F.prototype = this.prototype;
    Class.prototype = new F();
    Class.prototype.constructor = Class;

    Class.extend = callee;
    Class.mixin  = function(Mixin) {
      for(var method in Mixin.prototype) {
        this.prototype[method] = Mixin.prototype[method];
      }
    }

    return Class;
  }
}());

var Person = Class.define(
  function(name) {
    this.name = name;
  }
); 

var Coder = Person.extend(
  function() {
    this.parent.constructor.apply(this, arguments);
  }
);

var Manager = Person.extend(
  function(name, salary) {
    this.parent.constructor.apply(this, arguments);
    this.salary = "$" + salary + ".00 / Hour";
  }
);

var Suit = Manager.extend(
  function(options) {
    var args = [];
    args.push(options.name);
    args.push(options.salary);
    args.push(options.position);
    this.parent.constructor.apply(this, args);
  }
);

var p = new Person("Sam");
var c = new Coder("Bob");

debug.log("Is " + p.name + " a person: " + (p instanceof Person));
debug.log("Is " + p.name + " a coder: " + (p instanceof Coder));

debug.log("Is " + c.name + " a person: " + (c instanceof Person));
debug.log("Is " + c.name + " a coder: " + (c instanceof Coder));

Person.prototype.canTouchType = "no";

debug.log("Can " + p.name + " touch-type?: " + p.canTouchType);
debug.log("Can " + c.name + " touch-type?: " + c.canTouchType);

debug.log("Are you sure? What about now?");

Coder.prototype.canTouchType = "yes!";

debug.log("Can " + p.name + " touch-type?: " + p.canTouchType);
debug.log("Can " + c.name + " touch-type?: " + c.canTouchType);

var m = new Manager("Christine", 100);

debug.log("Is " + m.name + " a person: " + (m instanceof Person));
debug.log("Is " + m.name + " a coder: " + (m instanceof Coder));
debug.log("Is " + m.name + " a manager: " + (m instanceof Manager));

debug.log("How much money does " + m.name + " make?: " + m.salary);
debug.log("Can " + m.name + " touch-type?: " + m.canTouchType);

var s = new Suit({"name": "Barry", "position": "COO"});

debug.log("Is " + s.name + " a person: " + (s instanceof Person));
debug.log("Is " + s.name + " a coder: " + (s instanceof Coder));
debug.log("Is " + s.name + " a manager: " + (s instanceof Manager));
debug.log("Is " + s.name + " a suit: " + (s instanceof Suit));

debug.log("How much money does " + s.name + " make?: " + s.salary);
debug.log("Can " + s.name + " touch-type?: " + s.canTouchType);