Perfect

SELECT * FROM gallery2 WHERE topic_id="778448" UNION SELECT * FROM gallery2 WHERE topic_id="226562" UNION SELECT * FROM gallery2 WHERE topic_id="1788104" UNION SELECT * FROM gallery2 WHERE topic_id="872592" UNION SELECT * FROM gallery2 WHERE topic_id="1096173" UNION SELECT * FROM gallery2 WHERE topic_id="28300" UNION SELECT * FROM gallery2 WHERE topic_id="1677991" UNION SELECT * FROM gallery2 WHERE topic_id="1025104" UNION SELECT * FROM gallery2 WHERE topic_id="526004" UNION SELECT * FROM gallery2 WHERE topic_id="1272272" UNION SELECT * FROM gallery2 WHERE topic_id="1680595" UNION SELECT * FROM gallery2 WHERE topic_id="616983" UNION SELECT * FROM gallery2 WHERE topic_id="225469" UNION SELECT * FROM gallery2 WHERE topic_id="1655706" UNION SELECT * FROM gallery2 WHERE topic_id="1249719" UNION SELECT * FROM gallery2 WHERE topic_id="286006"