[2] Why not both?

SELECT * FROM gallery2 WHERE topic_id="1745455" UNION SELECT * FROM gallery2 WHERE topic_id="261679" UNION SELECT * FROM gallery2 WHERE topic_id="59815" UNION SELECT * FROM gallery2 WHERE topic_id="359761" UNION SELECT * FROM gallery2 WHERE topic_id="383026" UNION SELECT * FROM gallery2 WHERE topic_id="1801461" UNION SELECT * FROM gallery2 WHERE topic_id="1666083" UNION SELECT * FROM gallery2 WHERE topic_id="1467245" UNION SELECT * FROM gallery2 WHERE topic_id="297874" UNION SELECT * FROM gallery2 WHERE topic_id="1557277" UNION SELECT * FROM gallery2 WHERE topic_id="613887" UNION SELECT * FROM gallery2 WHERE topic_id="593196" UNION SELECT * FROM gallery2 WHERE topic_id="1076418" UNION SELECT * FROM gallery2 WHERE topic_id="943680" UNION SELECT * FROM gallery2 WHERE topic_id="1769421" UNION SELECT * FROM gallery2 WHERE topic_id="322641"