[Desert Ice Sports]

I'd like to know if there is any way to do the following two things:

1) Take a category display and narrow it down by another category. So we are displaying 'Sports Cards', and some of those items are also in the 'Autographed Memorabilia' category, I would like to be able to create a checkbox via the javascript API that narrows the display to only those sports cards that are also autographed. I would prefer not to do this by having a separate category for every single possible variation of two categories, since adding items would be ridiculously labor-intensive (I have a lot of categories).

2) Be able to 'narrow' a display with a search (search within the category currently being displayed). It would be nice to be able to narrow a search with another search, but that's less important.

Don't see any way of doing these things in the Javascript API, and I would reeeeeEEEeeEEeeally rather not use the PHP API.