Trying this out

SELECT * FROM gallery2 WHERE topic_id="662853" UNION SELECT * FROM gallery2 WHERE topic_id="1078817" UNION SELECT * FROM gallery2 WHERE topic_id="1404578" UNION SELECT * FROM gallery2 WHERE topic_id="1255796" UNION SELECT * FROM gallery2 WHERE topic_id="208543" UNION SELECT * FROM gallery2 WHERE topic_id="1803954" UNION SELECT * FROM gallery2 WHERE topic_id="621230" UNION SELECT * FROM gallery2 WHERE topic_id="1583724" UNION SELECT * FROM gallery2 WHERE topic_id="1536636" UNION SELECT * FROM gallery2 WHERE topic_id="789063" UNION SELECT * FROM gallery2 WHERE topic_id="854181" UNION SELECT * FROM gallery2 WHERE topic_id="1211822" UNION SELECT * FROM gallery2 WHERE topic_id="429372" UNION SELECT * FROM gallery2 WHERE topic_id="1785882" UNION SELECT * FROM gallery2 WHERE topic_id="839268" UNION SELECT * FROM gallery2 WHERE topic_id="819197"