Implements hook_menu_site_status_alter().
function openid_menu_site_status_alter(&$menu_site_status, $path) {
// Allow access to openid/authenticate even if site is in offline mode.
if ($menu_site_status == MENU_SITE_OFFLINE && user_is_anonymous() && $path == 'openid/authenticate') {
$menu_site_status = MENU_SITE_ONLINE;
}
}