Warning: Undefined variable $user in /volume1/web/rickykung.com/cms/alpha/2011-03/20110330/classes/popUp/member/logout.php on line 2

Fatal error: Uncaught Error: Call to a member function logout() on null in /volume1/web/rickykung.com/cms/alpha/2011-03/20110330/classes/popUp/member/logout.php:2
Stack trace:
#0 {main}
  thrown in /volume1/web/rickykung.com/cms/alpha/2011-03/20110330/classes/popUp/member/logout.php on line 2