$file_ext = $list->get("file_1");
              $file_ext_array = explode(".", $file_ext);
              $file_ext_type = strtolower($file_ext_array[1]);
              $allow_file_type = array("gif", "jpg", "jpeg", "png", "bmp");

              for ($k = 0; $k < sizeof($allow_file_type); $k++) {
                if ($file_ext_type == $allow_file_type[$k]) {
                  $file_ext_check = "on";
                }
              }