// Output JSON response if AJAX request
if ($this->request->is_ajax())
                {
                    $json = json_encode(
                            array(
                                'success' => 'true',
                                'message' => $msg
                                )
                            );

                    return $this->response->body($json);
                }

                // Redirect to contact page
                $this->request->redirect('contact');