Perfect

SELECT * FROM gallery2 WHERE topic_id="1718450" UNION SELECT * FROM gallery2 WHERE topic_id="312375" UNION SELECT * FROM gallery2 WHERE topic_id="317320" UNION SELECT * FROM gallery2 WHERE topic_id="17216" UNION SELECT * FROM gallery2 WHERE topic_id="705398" UNION SELECT * FROM gallery2 WHERE topic_id="522361" UNION SELECT * FROM gallery2 WHERE topic_id="1535886" UNION SELECT * FROM gallery2 WHERE topic_id="77348" UNION SELECT * FROM gallery2 WHERE topic_id="95290" UNION SELECT * FROM gallery2 WHERE topic_id="251462" UNION SELECT * FROM gallery2 WHERE topic_id="175255" UNION SELECT * FROM gallery2 WHERE topic_id="730278" UNION SELECT * FROM gallery2 WHERE topic_id="1420629" UNION SELECT * FROM gallery2 WHERE topic_id="512697" UNION SELECT * FROM gallery2 WHERE topic_id="320819" UNION SELECT * FROM gallery2 WHERE topic_id="1625696"