(function(){
   //Defines the top level Class
   function Class() { }

   Class.prototype.construct = function() {};

   // getPrototypeOf polyfill
   if (typeof Object.getPrototypeOf !== "function")
   {
      Class.prototype.getPrototypeOf = "".__proto__ === String.prototype
         ? function (object) {
         return object.__proto__;
      }
         : function (object) {
         // May break if the constructor has been tampered with
         return object.constructor.prototype;
      };
   }
   else
      Class.prototype.getPrototypeOf = Object.getPrototypeOf;


   Class.extend = function(def) {
      var classDef = function() {
         if (arguments[0] !== Class) { this.construct.apply(this, arguments); }
      };

      var proto = new this(Class);

      proto.applyMembers(def, this.prototype);

      classDef.prototype = proto;

      //Give this new class the same static extend method
      classDef.extend = this.extend;

      return classDef;
   };

   Class.prototype.applyMembers = function (def, proto) {
      for (var n in def) {
         var item = def[n];
         if (item instanceof Function)
         {
            item._super = proto;
            item.function_name = n;
         }
         this[n] = item;
      }
   };

   Class.prototype._super = function (args) {
      var method = args.callee._super[args.callee.function_name];
      if (method)
         return method.apply(this, args);
   };

   wpj.Class = Class;
})();