Multiple Selection Menu (Post Icon Filtering) Help

[noonespecial]

I'm looking to create a "multiple selection" menu that includes the names of all the post icons I have on my forums.

What I want is for a user to be able to select all the "post icons" they don't want to see (filter out if you will) and then on my forums not display those threads.

I figured an "if" statement on the threadbit <if condition="not in array"> would probably work - but I'm having trouble figuring out the best way to tackle this.

Any ideas?