//http://ejohn.org/blog/simple-javascript-inheritance/
// Inspired by base2 and Prototype
(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.constructor = Class;

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

		return Class;
	};
})();