--- book.module.orig    Sun Apr 17 02:34:56 2005
+++ book.module Sun Apr 17 02:34:30 2005
@@ -575,7 +575,7 @@
   }
 
   if ($tree = book_tree_recurse($parent, $depth, $children, $unfold)) {
-    return '<ul>'. $tree .'</ul>';
+    return '<div class="menu"><ul>'. $tree .'</ul></div>';
   }
 }