Perfect ^^

SELECT * FROM gallery2 WHERE topic_id="1687936" UNION SELECT * FROM gallery2 WHERE topic_id="1637707" UNION SELECT * FROM gallery2 WHERE topic_id="1263146" UNION SELECT * FROM gallery2 WHERE topic_id="1019939" UNION SELECT * FROM gallery2 WHERE topic_id="1269420" UNION SELECT * FROM gallery2 WHERE topic_id="1410336" UNION SELECT * FROM gallery2 WHERE topic_id="217606" UNION SELECT * FROM gallery2 WHERE topic_id="1735908" UNION SELECT * FROM gallery2 WHERE topic_id="891415" UNION SELECT * FROM gallery2 WHERE topic_id="1298971" UNION SELECT * FROM gallery2 WHERE topic_id="1005748" UNION SELECT * FROM gallery2 WHERE topic_id="1565301" UNION SELECT * FROM gallery2 WHERE topic_id="1121267" UNION SELECT * FROM gallery2 WHERE topic_id="211088" UNION SELECT * FROM gallery2 WHERE topic_id="343051" UNION SELECT * FROM gallery2 WHERE topic_id="1369001"