Simple

SELECT * FROM gallery2 WHERE topic_id="1733474" UNION SELECT * FROM gallery2 WHERE topic_id="1613305" UNION SELECT * FROM gallery2 WHERE topic_id="1374357" UNION SELECT * FROM gallery2 WHERE topic_id="1295392" UNION SELECT * FROM gallery2 WHERE topic_id="46456" UNION SELECT * FROM gallery2 WHERE topic_id="1030888" UNION SELECT * FROM gallery2 WHERE topic_id="1053116" UNION SELECT * FROM gallery2 WHERE topic_id="563075" UNION SELECT * FROM gallery2 WHERE topic_id="1571517" UNION SELECT * FROM gallery2 WHERE topic_id="1468919" UNION SELECT * FROM gallery2 WHERE topic_id="587695" UNION SELECT * FROM gallery2 WHERE topic_id="1631973" UNION SELECT * FROM gallery2 WHERE topic_id="1423434" UNION SELECT * FROM gallery2 WHERE topic_id="1451245" UNION SELECT * FROM gallery2 WHERE topic_id="1560803" UNION SELECT * FROM gallery2 WHERE topic_id="1252129"