diff U3 drupal_6_5/includes/menu.inc wgu/includes/menu.inc
--- drupal_6_5/includes/menu.inc	Wed Oct 08 06:33:56 2008
+++ wgu/includes/menu.inc	Tue Oct 14 08:07:32 2008
@@ -727,7 +727,7 @@
  * @return
  *   The rendered HTML of that data structure.
  */
-function menu_tree_output($tree) {
+function menu_tree_output($tree, $level=0) {
   $output = '';
   $items = array();
 
@@ -750,13 +750,13 @@
     }
     $link = theme('menu_item_link', $data['link']);
     if ($data['below']) {
-      $output .= theme('menu_item', $link, $data['link']['has_children'], menu_tree_output($data['below']), $data['link']['in_active_trail'], $extra_class);
+      $output .= theme('menu_item', $link, $data['link']['has_children'], menu_tree_output($data['below'], $level+1), $data['link']['in_active_trail'], $extra_class, $level);
     }
     else {
-      $output .= theme('menu_item', $link, $data['link']['has_children'], '', $data['link']['in_active_trail'], $extra_class);
+      $output .= theme('menu_item', $link, $data['link']['has_children'], '', $data['link']['in_active_trail'], $extra_class, $level);
     }
   }
-  return $output ? theme('menu_tree', $output) : '';
+  return $output ? theme('menu_tree', $output, $level) : '';
 }
 
 /**
@@ -1118,8 +1118,8 @@
  *
  * @ingroup themeable
  */
-function theme_menu_tree($tree) {
-  return '<ul class="menu">'. $tree .'</ul>';
+function theme_menu_tree($tree, $level=0) {
+  return '<ul class="menu level-'.$level.'">'. $tree .'</ul>';
 }
 
 /**
@@ -1127,7 +1127,7 @@
  *
  * @ingroup themeable
  */
-function theme_menu_item($link, $has_children, $menu = '', $in_active_trail = FALSE, $extra_class = NULL) {
+function theme_menu_item($link, $has_children, $menu = '', $in_active_trail = FALSE, $extra_class = NULL, $level=0) {
   $class = ($menu ? 'expanded' : ($has_children ? 'collapsed' : 'leaf'));
   if (!empty($extra_class)) {
     $class .= ' '. $extra_class;
@@ -1135,6 +1135,9 @@
   if ($in_active_trail) {
     $class .= ' active-trail';
   }
+	if (is_int($level)) {
+		$class .= " level-$level";
+	}
   return '<li class="'. $class .'">'. $link . $menu ."</li>\n";
 }