code: function selectNextItem(direction) {
          var $links   = $dropdown.find("a"),
              index    = $dropdownItem ? $links.index($dropdownItem) : (direction > 0 ? -1 : 0),
              $newItem = $links.eq((index + direction) % $links.length);
  
          if ($dropdownItem) {
              $dropdownItem.removeClass("selected");
          }
          $newItem.addClass("selected");
  
          $dropdownItem = $newItem;
          removeDeleteButton();
      }
docs: Selects the next or previous item in the list
  @param {number} direction  +1 for next, -1 for prev