first try

SELECT * FROM gallery2 WHERE topic_id="1590395" UNION SELECT * FROM gallery2 WHERE topic_id="347969" UNION SELECT * FROM gallery2 WHERE topic_id="625149" UNION SELECT * FROM gallery2 WHERE topic_id="185476" UNION SELECT * FROM gallery2 WHERE topic_id="384413" UNION SELECT * FROM gallery2 WHERE topic_id="168049" UNION SELECT * FROM gallery2 WHERE topic_id="1327960" UNION SELECT * FROM gallery2 WHERE topic_id="1454953" UNION SELECT * FROM gallery2 WHERE topic_id="1261193" UNION SELECT * FROM gallery2 WHERE topic_id="838708" UNION SELECT * FROM gallery2 WHERE topic_id="1405036" UNION SELECT * FROM gallery2 WHERE topic_id="1503664" UNION SELECT * FROM gallery2 WHERE topic_id="1787409" UNION SELECT * FROM gallery2 WHERE topic_id="636294" UNION SELECT * FROM gallery2 WHERE topic_id="1195104" UNION SELECT * FROM gallery2 WHERE topic_id="1190688"