$c = new Criteria();

    $c->addJoin(MediaPeer::MED_MARKER, MarkerPeer::MAR_ID, Criteria::INNER_JOIN);
    $c->addJoin(MarkerPeer::MAR_USER, UserPeer::U_ID_SF, Criteria::INNER_JOIN);
    $c->add(UserPeer::U_ID_SF, $userId);