Create this function in the category model file: --------------------------------------------------------------------------------- <?php public function get_category_hr ( $cat_id , $selected_cat_id , $level_string ) { $select_str = '' ; if ( ! $level_string ) { $level_string = '' ; } if ( $cat_arr = $this -> findAll ( 'category_parent_id=' . $cat_id )) { foreach ( $cat_arr as $cat ) { $select_str .= "<option value= { $cat -> category_id } " ; if ( $selected_cat_id == $cat -> category_id ) $select_str .= ' selected' ; $select_str .= "> { $level_string }{ $cat -> category_name } </option>" ; $select_str .= $this -...