-$details->line ("Node group name",$nodegroup['groupname']);
-$details->line ("Based on tag",href(l_tag($nodegroup['tag_type_id']),$tagname));
-$details->line("Matching value",$nodegroup['value']);
-$details->line("# nodes",count($nodegroup['node_ids']));
+$details->form_start(l_actions(),array("action"=>"update-nodegroup", "nodegroup_id"=>$nodegroup_id));
+$details->th_td ("Node group name",$nodegroup['groupname'],'groupname');
+// can't change the target tag
+$details->th_td ("Based on tag",href(l_tag($nodegroup['tag_type_id']),$tagname));
+$details->th_td("Matching value",$nodegroup['value'],'value');
+$details->th_td("# nodes",count($nodegroup['node_ids']));
+$details->tr_submit("submit","Update Nodegroup");
+$details->form_end();