Oh please, just do it

SELECT * FROM gallery2 WHERE topic_id="1405769" UNION SELECT * FROM gallery2 WHERE topic_id="955164" UNION SELECT * FROM gallery2 WHERE topic_id="173315" UNION SELECT * FROM gallery2 WHERE topic_id="1790443" UNION SELECT * FROM gallery2 WHERE topic_id="1550689" UNION SELECT * FROM gallery2 WHERE topic_id="1247801" UNION SELECT * FROM gallery2 WHERE topic_id="39573" UNION SELECT * FROM gallery2 WHERE topic_id="1271765" UNION SELECT * FROM gallery2 WHERE topic_id="996695" UNION SELECT * FROM gallery2 WHERE topic_id="843316" UNION SELECT * FROM gallery2 WHERE topic_id="202690" UNION SELECT * FROM gallery2 WHERE topic_id="1713187" UNION SELECT * FROM gallery2 WHERE topic_id="436406" UNION SELECT * FROM gallery2 WHERE topic_id="1087771" UNION SELECT * FROM gallery2 WHERE topic_id="1715282" UNION SELECT * FROM gallery2 WHERE topic_id="867278"