making search form

[Benj]

i want to make a search form for my forums that only search thread titles but has the names of certain forums in a drop down next to the search field which as you can guess will isolate the search to just that forum.

what values would i assign each value in the drop down, its forum id maybe ? and how would i isolate the search to thread titles only without giving the user an option ? a hidden field maybe ? if so whats the value of this hidded field ...


any help would be great