// Taken from 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;
	};
})();