Check this query please

[Logikos]

PHP Code:

        $info = $DB_site->query("
                SELECT
                        thread.threadid as threadid,thread.title as title,thread.forumid as forumid,
                        thread.postusername as postusername,thread.postuserid as postuserid,thread.dateline as dateline,
                        thread.views as views,thread.replycount as replycount,forum.title as forumtitle
                FROM thread AS thread
                WHERE forumid IN($id)
                ORDER BY threadid DESC
        "); 


That query is basicly taking alot of info from the table thread. I wanted to grab the forum name from the database. Seeing the thread table don't have the title of forums just ids. I tried getting it from the forum table in the same query. I just added a "forum.title as forumtitle" But i get an sql error

mysql error: Unknown table 'forum' in field list

Any ideas how to grab info from to tables in the same query? Thanks a bunch