Ok. You defined the searchable topics in the hidden value (Which can be edited by everyone via inspect elements).
People can change which forums they want to see via the live search. Even hidden forums (Think about a forum only for administrators, moderators etc.)
So they can get the topics in the hidden forums. Not a big problem, but what if you include secret information in the topic title?
Hidden input > GET Parameter > Your PHP file > Query.. without any checks.
I like your idea, however your implantation looks a little bit strange to me. Why not prototype and ajax? That would make it even easier for you. So imho the implantation is bad (sorry :P) But overall a good hook and addition for my board. Thanks!
[quote name='IPS_Fan' timestamp='1335514196']
LO. Too cheap to pay someone $5.00 USD for the time they put into doing the work on a mod? If you are too cheap to pay the 5 bucks, then do just that - do it yourself, since it is "not very hard".
Actually he is right and this is very easy to create (If you know how to make hooks) but that doesn't matter. If you dont want to pay $5 for this then don't do it.