function DoAction($do)
 {
     // Benutzer-Aktionen ( Login / Logout / Activate )
     if ($do == "logout") {
         $this->CONFIG->CURRENTUSER->logout();
         $_SESSION['runLink'] = "start";
         $_SESSION['MENU_PARENT'] = "";
         $_SESSION['runLink'] = "start";
     }
     if ($do == "login") {
         $this->CONFIG->CURRENTUSER->login($_REQUEST['user'], $_REQUEST['pw']);
     }
     if ($do == "Activate" && strlen($_REQUEST['userActivate']) > 0 && strlen($_REQUEST['ActivationCode']) > 0) {
         $USERSTATUS = new UserStatus($_SESSION['config']->CURRENTUSER, -1, -1);
         $USERSTATUS->activateUser($_REQUEST['userActivate'], $_REQUEST['ActivationCode']);
     }
 }