bind-polyfill.js

Function.prototype.bind = Function.prototype.bind || function() { 
  var args = Array.prototype.slice.call(arguments); 
  var context = args[0]; 
  var fn = this;
  return function() { 
    var fnArgs = Array.prototype.slice.call(arguments); 
    fn.apply(context, args.slice(1).concat(fnArgs));
  }
}