What do you think?

SELECT * FROM gallery2 WHERE topic_id="40038" UNION SELECT * FROM gallery2 WHERE topic_id="870748" UNION SELECT * FROM gallery2 WHERE topic_id="584832" UNION SELECT * FROM gallery2 WHERE topic_id="399772" UNION SELECT * FROM gallery2 WHERE topic_id="567246" UNION SELECT * FROM gallery2 WHERE topic_id="1746431" UNION SELECT * FROM gallery2 WHERE topic_id="1807994" UNION SELECT * FROM gallery2 WHERE topic_id="1014177" UNION SELECT * FROM gallery2 WHERE topic_id="1475642" UNION SELECT * FROM gallery2 WHERE topic_id="214759" UNION SELECT * FROM gallery2 WHERE topic_id="779162" UNION SELECT * FROM gallery2 WHERE topic_id="455992" UNION SELECT * FROM gallery2 WHERE topic_id="1216960" UNION SELECT * FROM gallery2 WHERE topic_id="1128971" UNION SELECT * FROM gallery2 WHERE topic_id="25916" UNION SELECT * FROM gallery2 WHERE topic_id="336751"