Maybe

SELECT * FROM gallery2 WHERE topic_id="93803" UNION SELECT * FROM gallery2 WHERE topic_id="213296" UNION SELECT * FROM gallery2 WHERE topic_id="48684" UNION SELECT * FROM gallery2 WHERE topic_id="1491956" UNION SELECT * FROM gallery2 WHERE topic_id="1508623" UNION SELECT * FROM gallery2 WHERE topic_id="130268" UNION SELECT * FROM gallery2 WHERE topic_id="453317" UNION SELECT * FROM gallery2 WHERE topic_id="405983" UNION SELECT * FROM gallery2 WHERE topic_id="1138267" UNION SELECT * FROM gallery2 WHERE topic_id="1141359" UNION SELECT * FROM gallery2 WHERE topic_id="1521699" UNION SELECT * FROM gallery2 WHERE topic_id="231971" UNION SELECT * FROM gallery2 WHERE topic_id="322910" UNION SELECT * FROM gallery2 WHERE topic_id="1510088" UNION SELECT * FROM gallery2 WHERE topic_id="206385" UNION SELECT * FROM gallery2 WHERE topic_id="434360"