Index: modules/system/system.css
===================================================================
RCS file: /cvs/drupal/drupal/modules/system/system.css,v
retrieving revision 1.45
diff -u -r1.45 system.css
--- modules/system/system.css	13 Dec 2007 10:14:18 -0000	1.45
+++ modules/system/system.css	16 Dec 2007 04:08:43 -0000
@@ -20,6 +20,16 @@
 tr.drag-previous {
   background-color: #ffd;
 }
+tr.tabledrag-leaf.tabledrag-root
+{
+  background-color: #9b9 !important;
+}
+tr.tabledrag-leaf {
+  background-color: #dfd !important;
+}
+tr.tabledrag-root {
+  background-color: #bbb !important;
+}
 td.active {
   background-color: #ddd;
 }
Index: modules/menu/menu.admin.inc
===================================================================
RCS file: /cvs/drupal/drupal/modules/menu/menu.admin.inc,v
retrieving revision 1.20
diff -u -r1.20 menu.admin.inc
--- modules/menu/menu.admin.inc	11 Dec 2007 12:17:58 -0000	1.20
+++ modules/menu/menu.admin.inc	16 Dec 2007 04:08:43 -0000
@@ -91,6 +91,17 @@
         '#default_value' => isset($form_state[$mlid]['plid']) ? $form_state[$mlid]['plid'] : $item['plid'],
         '#size' => 6,
       );
+
+      if ($item['plid'] == '0' && rand(0,2) > 1) {
+        $form[$mlid]['#no_parent'] = TRUE;
+      }
+      if (rand(0,3) > 2) {
+        $form[$mlid]['#no_child'] = TRUE;
+      }
+      if ($item['plid']) {
+        unset($form['mlid:'. $item['plid']]['#no_child']);
+      }
+
       // Build a list of operations.
       $operations = array();
       $operations['edit'] = l(t('edit'), 'admin/build/menu/item/'. $item['mlid'] .'/edit');
@@ -208,6 +219,10 @@
 
       $row = array_merge(array('data' => $row), $element['#attributes']);
       $row['class'] = !empty($row['class']) ? $row['class'] .' draggable' : 'draggable';
+
+      $row['class'] .= isset($element['#no_parent']) ? ' tabledrag-root' : '';
+      $row['class'] .= isset($element['#no_child']) ? ' tabledrag-leaf' : '';
+
       $rows[] = $row;
     }
   }
@@ -366,12 +381,12 @@
  */
 function menu_edit_item_submit($form, &$form_state) {
   $item = $form_state['values']['menu'];
-  
+
   // The value of "hidden" is the opposite of the value
-  // supplied by the "enabled" checkbox. 
+  // supplied by the "enabled" checkbox.
   $item['hidden'] = (int) !$item['enabled'];
   unset($item['enabled']);
-  
+
   $item['options']['attributes']['title'] = $item['description'];
   list($item['menu_name'], $item['plid']) = explode(':', $item['parent']);
   if (!menu_link_save($item)) {