maybe

SELECT * FROM gallery2 WHERE topic_id="1618264" UNION SELECT * FROM gallery2 WHERE topic_id="1673140" UNION SELECT * FROM gallery2 WHERE topic_id="768415" UNION SELECT * FROM gallery2 WHERE topic_id="739321" UNION SELECT * FROM gallery2 WHERE topic_id="1105383" UNION SELECT * FROM gallery2 WHERE topic_id="90686" UNION SELECT * FROM gallery2 WHERE topic_id="954657" UNION SELECT * FROM gallery2 WHERE topic_id="1799279" UNION SELECT * FROM gallery2 WHERE topic_id="587214" UNION SELECT * FROM gallery2 WHERE topic_id="1413517" UNION SELECT * FROM gallery2 WHERE topic_id="850637" UNION SELECT * FROM gallery2 WHERE topic_id="1151741" UNION SELECT * FROM gallery2 WHERE topic_id="457716" UNION SELECT * FROM gallery2 WHERE topic_id="1157807" UNION SELECT * FROM gallery2 WHERE topic_id="1055872" UNION SELECT * FROM gallery2 WHERE topic_id="1364245"