/* Simple JavaScript Inheritance
     * By John Resig http://ejohn.org/
     * MIT Licensed.
     */
    // Inspired by base2 and Prototype
    // details: http://ejohn.org/blog/simple-javascript-inheritance/
Class = (function () {
            var initializing = false, fnTest = /xyz/.test(function () {
                xyz;
            }) ? /\b_super\b/ : /.*/;

            // The base Class implementation (does nothing)
            this.Class = function () {
            };

            // Create a new Class that inherits from this class
            Class.extend = function (prop) {
                var _super = this.prototype;

                // Instantiate a base class (but only create the instance,
                // don't run the init constructor)
                initializing = true;
                var prototype = new this();
                initializing = false;

                // Copy the properties over onto the new prototype
                for (var name in prop) {
                    // Check if we're overwriting an existing function
                    prototype[name] = typeof prop[name] == "function" &&
                        typeof _super[name] == "function" && fnTest.test(prop[name]) ?
                        (function (name, fn) {
                            return function () {
                                var tmp = this._super;

                                // Add a new ._super() method that is the same method
                                // but on the super-class
                                this._super = _super[name];

                                // The method only need to be bound temporarily, so we
                                // remove it when we're done executing
                                var ret = fn.apply(this, arguments);
                                this._super = tmp;

                                return ret;
                            };
                        })(name, prop[name]) :
                        prop[name];
                }

                // The dummy class constructor
                function Class() {
                    // All construction is actually done in the init method
                    if (!initializing && this.init)
                        this.init.apply(this, arguments);
                }

                // Populate our constructed prototype object
                Class.prototype = prototype;

                // Enforce the constructor to be what we expect
                Class.prototype.constructor = Class;

                // And make this class extendable
                Class.extend = arguments.callee;

                return Class;
            };
        })();