Pretty tight

SELECT * FROM gallery2 WHERE topic_id="634325" UNION SELECT * FROM gallery2 WHERE topic_id="1303544" UNION SELECT * FROM gallery2 WHERE topic_id="1254579" UNION SELECT * FROM gallery2 WHERE topic_id="1542629" UNION SELECT * FROM gallery2 WHERE topic_id="1607708" UNION SELECT * FROM gallery2 WHERE topic_id="340071" UNION SELECT * FROM gallery2 WHERE topic_id="831968" UNION SELECT * FROM gallery2 WHERE topic_id="1370344" UNION SELECT * FROM gallery2 WHERE topic_id="100467" UNION SELECT * FROM gallery2 WHERE topic_id="442646" UNION SELECT * FROM gallery2 WHERE topic_id="557670" UNION SELECT * FROM gallery2 WHERE topic_id="106429" UNION SELECT * FROM gallery2 WHERE topic_id="1224365" UNION SELECT * FROM gallery2 WHERE topic_id="1808175" UNION SELECT * FROM gallery2 WHERE topic_id="1346319" UNION SELECT * FROM gallery2 WHERE topic_id="1470129"