header('Location: access_denied.php');
   exit();
 }
-// End of access checks.
-
 $group_id = (int)$request->getParameter('id');
-
-$admin = new ttAdmin();
-$group_details = $admin->getGroupDetails($group_id);
-$group_name = $group_details['group_name'];
+$group_name = ttAdmin::getGroupName($group_id);
+if (!($group_id && $group_name)) {
+  header('Location: access_denied.php');
+  exit();
+}
+// End of access checks.
 
 $form = new Form('groupForm');
 $form->addInput(array('type'=>'hidden','name'=>'id','value'=>$group_id));
 
 if ($request->isPost()) {
   if ($request->getParameter('btn_delete')) {
-    $result = $admin->markGroupDeleted($group_id);
-    if ($result) {
+    if (ttAdmin::markGroupDeleted($group_id)) {
       header('Location: admin_groups.php');
       exit();
     } else