public function login()
        {
            $this->input = Kohana::instance()->input;
            $username = $this->input->post('username');
            $password = $this->input->post('password');


            $user = ORM::factory('user', $username);
            $this->auth = new Auth();

            $user->username = $username;
            $user->password = $password;

            if (!$user->loaded()) // if user is not found
            {
                echo "USERNAME not valid";
            } else if ($this->auth->login($username, $password)) { // if login() is returns TRUE
                echo "Hello, " . $this->auth->get_user()->username;// greet the user
            } else {
                echo "Login failed!";
            }
        }