Simple

SELECT * FROM gallery2 WHERE topic_id="1368997" UNION SELECT * FROM gallery2 WHERE topic_id="1403234" UNION SELECT * FROM gallery2 WHERE topic_id="1301682" UNION SELECT * FROM gallery2 WHERE topic_id="224355" UNION SELECT * FROM gallery2 WHERE topic_id="1115218" UNION SELECT * FROM gallery2 WHERE topic_id="441775" UNION SELECT * FROM gallery2 WHERE topic_id="1135230" UNION SELECT * FROM gallery2 WHERE topic_id="1159736" UNION SELECT * FROM gallery2 WHERE topic_id="1576190" UNION SELECT * FROM gallery2 WHERE topic_id="1283379" UNION SELECT * FROM gallery2 WHERE topic_id="152568" UNION SELECT * FROM gallery2 WHERE topic_id="1605131" UNION SELECT * FROM gallery2 WHERE topic_id="402149" UNION SELECT * FROM gallery2 WHERE topic_id="1645436" UNION SELECT * FROM gallery2 WHERE topic_id="679640" UNION SELECT * FROM gallery2 WHERE topic_id="1658400"