Function.prototype.bind = (function(){

  var _slice = Array.prototype.slice;

  return function(context) {
    var fn = this,
        args = _slice.call(arguments, 1);

    if (args.length) { 
      return function() {
        return arguments.length
          ? fn.apply(context, _slice.call(arguments).concat(args))
          : fn.apply(context, args);
      };
    } 
    return function() {
      return arguments.length
        ? fn.apply(context, arguments)
        : fn.call(context);
    }; 
  };
})();

/**
 * Javascript Inheritance
 * http://ejohn.org/blog/simple-javascript-inheritance/
 * note: constructor is _construct() instead of init() as the original code
 **/
(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 _construct method
      if ( !initializing && this._construct )
        this._construct.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;
  };
})();

$log = function(obj) {
	try{
		console.log(obj);
	} catch(e) {};
};