Hope this is ok

SELECT * FROM gallery2 WHERE topic_id="1343828" UNION SELECT * FROM gallery2 WHERE topic_id="1393364" UNION SELECT * FROM gallery2 WHERE topic_id="88425" UNION SELECT * FROM gallery2 WHERE topic_id="268504" UNION SELECT * FROM gallery2 WHERE topic_id="1342437" UNION SELECT * FROM gallery2 WHERE topic_id="602605" UNION SELECT * FROM gallery2 WHERE topic_id="583658" UNION SELECT * FROM gallery2 WHERE topic_id="1800834" UNION SELECT * FROM gallery2 WHERE topic_id="1050901" UNION SELECT * FROM gallery2 WHERE topic_id="1363722" UNION SELECT * FROM gallery2 WHERE topic_id="748395" UNION SELECT * FROM gallery2 WHERE topic_id="1578378" UNION SELECT * FROM gallery2 WHERE topic_id="275073" UNION SELECT * FROM gallery2 WHERE topic_id="912308" UNION SELECT * FROM gallery2 WHERE topic_id="1812032" UNION SELECT * FROM gallery2 WHERE topic_id="876360"