Both forms are allowed and the meaning is the same. But verb 1 sounds very very oldfashioned and clumsy and is used very rarely. Therefore it is strongly recommended to use exclusively verb 2! The complete table of conjugation of verb 2 may be found here: http://canoo.net/inflection/durchsuchen:V:haben:No-Detach and the one of verb 1 here: http://canoo.net/inflection/durchsuchen:V:haben:Detach (not recommended).