/**
  * Display form that permits to add a new link
  *
  * @access	private
  */
 private function display_form()
 {
     Html::nl_form('o', $this->_link->_name, $this->_link->_link, $this->_link->_rss_link, $this->_link->_notes);
     foreach ($this->_levels as $key => $value) {
         Html::opt_priority($key, $value, $this->_link->_priority);
     }
     Html::nl_form('c');
     if ($this->_view_type == 'edit') {
         Html::nl_update();
     } else {
         Html::nl_add();
     }
 }