Mine

<?php
class Blog extends Controller {

  function index()
  {
    $this->load->helper('url');
    echo '<br>';
    $query = $this->db->query('select * from images order by id limit 10');
    foreach ($query->result_array() as $row)
      {
        echo $row['id'].'<br>';
        echo $row['file_main'].'<br>';
        echo $row['file_thumb'].'<br>';

        $id = $row['id'];
        $main = $row['file_main'];
        $thumb = $row['file_thumb'];

        //      echo $id.'<img src="../'.$thumb.'>';                                                    
        echo $id.'<img src="'.base_url().'/'.$thumb.'>';
      }
  }
}
?>