diff -Naurp dhtml_menu.bullets/dhtml_menu.js dhtml_menu/dhtml_menu.js
--- dhtml_menu.bullets/dhtml_menu.js	2010-04-14 22:52:11.000000000 +0200
+++ dhtml_menu/dhtml_menu.js	2010-04-14 22:51:42.000000000 +0200
@@ -119,7 +119,7 @@ Drupal.dhtmlMenu.toggleMenu = function(l
 
     // If the siblings effect is on, close all sibling menus.
     if (effects.siblings) {
-      var id = $(li).find('a:first').attr('id');
+      var id = effects.bullets ? $(li).find('a:eq(1)').attr('id') : $(li).find('a:first').attr('id');
 
       // Siblings are all open menus that are neither parents nor children of this menu.
       $(li).find('li').addClass('own-children-temp');