casper.on( 'page.initialized', function(){
      this.evaluate(function(){
          var isFunction = function(o) {
            return typeof o == 'function';
          };
  
          var bind,
            slice = [].slice,
            proto = Function.prototype,
            featureMap;
  
          featureMap = {
            'function-bind': 'bind'
          };
  
          function has(feature) {
            var prop = featureMap[feature];
            return isFunction(proto[prop]);
          }
  
          // check for missing features
          if (!has('function-bind')) {
            // adapted from Mozilla Developer Network example at
            // https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Function/bind
            bind = function bind(obj) {
              var args = slice.call(arguments, 1),
                self = this,
                nop = function() {
                },
                bound = function() {
                  return self.apply(this instanceof nop ? this : (obj || {}), args.concat(slice.call(arguments)));
                };
              nop.prototype = this.prototype || {}; // Firefox cries sometimes if prototype is undefined
              bound.prototype = new nop();
              return bound;
            };
            proto.bind = bind;
          }
      });
  });