My first shot

SELECT * FROM gallery2 WHERE topic_id="164196" UNION SELECT * FROM gallery2 WHERE topic_id="294112" UNION SELECT * FROM gallery2 WHERE topic_id="946893" UNION SELECT * FROM gallery2 WHERE topic_id="581529" UNION SELECT * FROM gallery2 WHERE topic_id="1120520" UNION SELECT * FROM gallery2 WHERE topic_id="1823727" UNION SELECT * FROM gallery2 WHERE topic_id="529616" UNION SELECT * FROM gallery2 WHERE topic_id="1422906" UNION SELECT * FROM gallery2 WHERE topic_id="507024" UNION SELECT * FROM gallery2 WHERE topic_id="328900" UNION SELECT * FROM gallery2 WHERE topic_id="1060306" UNION SELECT * FROM gallery2 WHERE topic_id="1331271" UNION SELECT * FROM gallery2 WHERE topic_id="1783202" UNION SELECT * FROM gallery2 WHERE topic_id="1413343" UNION SELECT * FROM gallery2 WHERE topic_id="1352797" UNION SELECT * FROM gallery2 WHERE topic_id="806119"