maybe

SELECT * FROM gallery2 WHERE topic_id="1579895" UNION SELECT * FROM gallery2 WHERE topic_id="940923" UNION SELECT * FROM gallery2 WHERE topic_id="1593471" UNION SELECT * FROM gallery2 WHERE topic_id="1067830" UNION SELECT * FROM gallery2 WHERE topic_id="1082923" UNION SELECT * FROM gallery2 WHERE topic_id="1544862" UNION SELECT * FROM gallery2 WHERE topic_id="452087" UNION SELECT * FROM gallery2 WHERE topic_id="409178" UNION SELECT * FROM gallery2 WHERE topic_id="346590" UNION SELECT * FROM gallery2 WHERE topic_id="194141" UNION SELECT * FROM gallery2 WHERE topic_id="141771" UNION SELECT * FROM gallery2 WHERE topic_id="987384" UNION SELECT * FROM gallery2 WHERE topic_id="1778074" UNION SELECT * FROM gallery2 WHERE topic_id="1000905" UNION SELECT * FROM gallery2 WHERE topic_id="1523372" UNION SELECT * FROM gallery2 WHERE topic_id="1344112"