[JohnM]

demolition:

change:
$moderators=$DB_site->query("SELECT DISTINCT userid, user.email FROM moderator,user WHERE user.userid=moderator.userid AND moderator.forumid IN ($foruminfo[parentlist])");

to:
$moderators=$DB_site->query("SELECT DISTINCT user.userid, user.email FROM moderator,user WHERE user.userid=moderator.userid AND moderator.forumid IN ($foruminfo[parentlist])");

Psycho: make sure you didn't overwrite the } for the while() loop