public function login() {
                $this->load->model('blog_model');
                if($this->input->post('username')) {
                        $username = $this->input->post('username');
                        $password = $this->input->post('password');

                        $allow = $this->blog_model->userpass_check($username, $password);

                        if($allow != 'true') {
                                redirect('blog/login_form');
                        } else {
                                $data = array(
                                        'username' => $username,
                                        'logged_in' => true
                                );
                                $this->session->set_userdata($data);

                                redirect('blog/view_blog/'.$this->session->userdata('username'));
                        }
                } else {
                        $this->load->view('login_form');
                }
        }