public function login(){
			$data['title'] = 'Masuk';


			$this->form_validation->set_rules('username','Username','required');

			$this->form_validation->set_rules('password','Password','required');


			if($this->form_validation->run() === FALSE){
				$this->load->view('templates/header');
				$this->load->view('users/login', $data);
				$this->load->view('templates/footer');

			}else{

				// get username

				$username = $this->input->post('username');
				// get and encrypt the password
				$password = md5($this->input->post('password'));

				// LOgin User
				$user_id = $this->user_model->login($username,$password);

				if($user_id){
					// create session
					$user_data = array(
						'user_id' => $user_id,
						'username' => $username,
						'logged_in' => true
						);

					$this->session->set_userdata($user_data);
					// set message

					$this->session->set_flashdata('user_loggedin','Anda sekarang sudah login');

				redirect('surat_masuk');

				}else{

				// Set message

				if (isset($_SESSION['auth'])) {
					//jika user gagal masuk selama 3x atau lebih
					{

						if ($_SESSION['auth']>2 || $_SESSION['auth']==2) {
							//set nilai session 'auth' ke 4

						$_SESSION['auth']=3;
						//jalankan function blokir user
						echo "<h1>ANDA TERBLOKIR</h1>";
						die();
						}

					}
				}
				$this->session->set_flashdata('login_failed','Anda gagal login');


				redirect('');
				}

			}
		}