--- fieldgroup.install.orig	2008-08-26 14:01:00.000000000 +0200
+++ fieldgroup.install	2008-07-28 11:44:33.000000000 +0200
@@ -8,6 +8,7 @@ function fieldgroup_install() {
       db_query("CREATE TABLE {node_group} (
                 `type_name` varchar(32) NOT NULL default '',
                 `group_name` varchar(32) NOT NULL default '',
+                `parent_group_name` varchar(32) NULL default '',
                 `label` varchar(255) NOT NULL default '',
                 `settings` mediumtext NOT NULL,
                 `weight` tinyint(4) NOT NULL,
@@ -24,6 +25,7 @@ function fieldgroup_install() {
       db_query("CREATE TABLE {node_group} (
                 type_name varchar(32) NOT NULL default '',
                 group_name varchar(32) NOT NULL default '',
+                parent_group_name varchar(32) NULL default '',
                 label varchar(255) NOT NULL default '',
                 settings text NOT NULL,
                 weight smallint NOT NULL,
@@ -144,3 +146,10 @@ function fieldgroup_update_4() {
   $ret[] = update_sql("UPDATE {system} SET weight = 9 WHERE name = 'fieldgroup'");
   return $ret;
 }
+
+function fieldgroup_update_5() {
+  $ret = array();
+  $ret[] = update_sql("ALTER TABLE {node_group} ADD parent_group_name VARCHAR(32) NULL DEFAULT ''");
+
+  return $ret;
+}