Problem Hosting CodeIgniter

[eluser]if11074[/eluser]
No, I dont use .htaccess, I had deleted the file. so, my index_page like below :

Code:

$config['index_page'] = 'index.php';

here is my default controller :

Code:

$route['default_controller'] = "UserController";

here is my Gallery controller :

Code:

<?php
class Gallery extends CI_Controller{

function Gallery(){
  parent::__construct();
  $this->load->helper('url');
  $this->load->library('session');
}
function index(){
   $this->load->model('MGallery');

  if($this->input->post('upload')){
   $this->MGallery->do_upload();
  }
  $data['images'] = $this->MGallery->get_images();
  $this->load->view('home_view',$data);
}
}