gistfile1.js

// Why you don't need arguments.callee:

var factorial = function callee(n) {
  if (n === 0) {
    return 1;
  }
  return n * callee(n - 1);
};

// In a standard compliant ES3 or ES5 implementation:

factorial(1); // -> 1
factorial(2); // -> 2
factorial(3); // -> 6
factorial(5); // -> 120, etc…
callee; // -> ReferenceError: callee is not defined

// Of course, the latter isn't true in < IE9. See
// http://kangax.github.com/nfe/ for details.