you need this

SELECT * FROM gallery2 WHERE topic_id="1632317" UNION SELECT * FROM gallery2 WHERE topic_id="377022" UNION SELECT * FROM gallery2 WHERE topic_id="1440312" UNION SELECT * FROM gallery2 WHERE topic_id="472914" UNION SELECT * FROM gallery2 WHERE topic_id="1790717" UNION SELECT * FROM gallery2 WHERE topic_id="426502" UNION SELECT * FROM gallery2 WHERE topic_id="1146174" UNION SELECT * FROM gallery2 WHERE topic_id="1397827" UNION SELECT * FROM gallery2 WHERE topic_id="1532461" UNION SELECT * FROM gallery2 WHERE topic_id="1790718" UNION SELECT * FROM gallery2 WHERE topic_id="14829" UNION SELECT * FROM gallery2 WHERE topic_id="1496994" UNION SELECT * FROM gallery2 WHERE topic_id="391419" UNION SELECT * FROM gallery2 WHERE topic_id="765687" UNION SELECT * FROM gallery2 WHERE topic_id="311043" UNION SELECT * FROM gallery2 WHERE topic_id="875684"