Index: menu.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/menu.inc,v
retrieving revision 1.394
diff -d -u -r1.394 menu.inc
--- menu.inc	28 May 2010 10:18:57 -0000	1.394
+++ menu.inc	31 May 2010 08:36:02 -0000
@@ -905,13 +905,13 @@
     }
   }
 
-  $num_items = count($items);
+  $last_item = count($items) - 1;
   foreach ($items as $i => $data) {
     $class = array();
     if ($i == 0) {
       $class[] = 'first';
     }
-    if ($i == $num_items - 1) {
+    if ($i == $last_item) {
       $class[] = 'last';
     }
     // Set a class if the link has children.