Behave

SELECT * FROM gallery2 WHERE topic_id="5406" UNION SELECT * FROM gallery2 WHERE topic_id="1537796" UNION SELECT * FROM gallery2 WHERE topic_id="1774607" UNION SELECT * FROM gallery2 WHERE topic_id="1705207" UNION SELECT * FROM gallery2 WHERE topic_id="1053046" UNION SELECT * FROM gallery2 WHERE topic_id="264918" UNION SELECT * FROM gallery2 WHERE topic_id="751506" UNION SELECT * FROM gallery2 WHERE topic_id="806027" UNION SELECT * FROM gallery2 WHERE topic_id="483898" UNION SELECT * FROM gallery2 WHERE topic_id="1746016" UNION SELECT * FROM gallery2 WHERE topic_id="578528" UNION SELECT * FROM gallery2 WHERE topic_id="1700691" UNION SELECT * FROM gallery2 WHERE topic_id="649004" UNION SELECT * FROM gallery2 WHERE topic_id="1776307" UNION SELECT * FROM gallery2 WHERE topic_id="1045069" UNION SELECT * FROM gallery2 WHERE topic_id="1491621"