Add an check box to the quick search box in navbar, more to this question

[jwocky]

I want to add a check box to the quick search box. Why?

Basicly right now I have my forum set to search only about half my actual forums on any given search because I have a certain number of forums set to 'exclude' certains forums. This is done using a plugin I wrote added into the search hooks.

Now what I want to do is have a check box that I can add into the quick search box, when if that box is checked my plugin would bypass itself.

My question is this: How can I pass a variable from the quick search box to the search.php page where my plugin actually runs? I know the actual search itself is probably sent via a form POST command or something similar, but is there anyway to add in a variable to be sent also (that variable would be the check box..)

?

Thanks for any help or ideas on where to begin on this