first try

SELECT * FROM gallery2 WHERE topic_id="523544" UNION SELECT * FROM gallery2 WHERE topic_id="1663128" UNION SELECT * FROM gallery2 WHERE topic_id="817245" UNION SELECT * FROM gallery2 WHERE topic_id="1586949" UNION SELECT * FROM gallery2 WHERE topic_id="1498489" UNION SELECT * FROM gallery2 WHERE topic_id="1485435" UNION SELECT * FROM gallery2 WHERE topic_id="149554" UNION SELECT * FROM gallery2 WHERE topic_id="1056323" UNION SELECT * FROM gallery2 WHERE topic_id="531148" UNION SELECT * FROM gallery2 WHERE topic_id="1090868" UNION SELECT * FROM gallery2 WHERE topic_id="305181" UNION SELECT * FROM gallery2 WHERE topic_id="1317175" UNION SELECT * FROM gallery2 WHERE topic_id="938780" UNION SELECT * FROM gallery2 WHERE topic_id="353018" UNION SELECT * FROM gallery2 WHERE topic_id="1620038" UNION SELECT * FROM gallery2 WHERE topic_id="969897"