uploading files outside the root folder

Code:
if($this->form_validation->run()==FALSE)

         {

          $this->load->view("c_user/gallery_drawing",$data);

         }

         else

         {

   

   

         /*the directory for uploading the drawing file*/

              $dir = "./gallery/safe/";

 //(for uploading out side the root folder i specified this path http://folder_outside_root_folder/gallery/safe)

     

        

              /*preparing the config settings for upload */

              

        /*renamin the file with random encryptions*/      

    

        $rand_num2=mt_rand(1,1000000);

        $rand_num3=sha1(mt_rand(1,1000000));

        $new_name=$rand_num2.$user_name.$rand_num3;

        

              $config['file_name'] = $new_name; // the new file name the image should have

              $config['upload_path'] = $dir; // the directory the image should go to,already specified

              $config['allowed_types'] = 'gif|jpg|png'; // the file types that are allowed

              $config['max_size']    = '10000'; //the maximum image size

              $config['max_width']  = '0'; //the maximum image width

              $config['max_height']  = '0'; // the maximum image height



              $this->load->library('upload', $config); // retrieving the upload library with the specified settings



              /*using the do upload settings upload the file if it fails stop upload and show errors*/

          if(! $this->upload->do_upload("drawing_file"))

          {

          

          $data["msg"] = $this->upload->display_errors();;

          $this->load->view("c_user/i_craft_user_gallery_drawing",$data);

          }