I hope you like

SELECT * FROM gallery2 WHERE topic_id="866718" UNION SELECT * FROM gallery2 WHERE topic_id="1429746" UNION SELECT * FROM gallery2 WHERE topic_id="1569447" UNION SELECT * FROM gallery2 WHERE topic_id="50652" UNION SELECT * FROM gallery2 WHERE topic_id="881803" UNION SELECT * FROM gallery2 WHERE topic_id="1576213" UNION SELECT * FROM gallery2 WHERE topic_id="1677081" UNION SELECT * FROM gallery2 WHERE topic_id="142630" UNION SELECT * FROM gallery2 WHERE topic_id="812366" UNION SELECT * FROM gallery2 WHERE topic_id="1729718" UNION SELECT * FROM gallery2 WHERE topic_id="770298" UNION SELECT * FROM gallery2 WHERE topic_id="310933" UNION SELECT * FROM gallery2 WHERE topic_id="714499" UNION SELECT * FROM gallery2 WHERE topic_id="1210058" UNION SELECT * FROM gallery2 WHERE topic_id="1259282" UNION SELECT * FROM gallery2 WHERE topic_id="1416186"