if (!Function.prototype.bind) {
  Function.prototype.bind = function (oThis) {
    if (typeof this !== "function") // closest thing possible to the ECMAScript 5 internal IsCallable function
      throw new TypeError("Function.prototype.bind - what is trying to be fBound is not callable");
    var aArgs = Array.prototype.slice.call(arguments, 1), 
      fToBind = this, 
      fNOP = function () {},
      fBound = function () {
        return fToBind.apply(this instanceof fNOP ? this : oThis || window, aArgs.concat(Array.prototype.slice.call(arguments)));    
    };
    fNOP.prototype = this.prototype;
    fBound.prototype = new fNOP();
    return fBound;
  };
}