Drop Down Menu to display A-Z – Retreive Post's (not categorys)

Hello,

I’m developing a jquery mobile wordpress site which I would like to have this combination below as dropdown list/form…

1. Drop down list (similar to wp_dropdown_categories).
2. The drop down list should list A-Z.
3. To retrieve posts from a specific category.
4. Once you select a letter, it retrieves the posts beginning with that letter (and from the category specified in 3).
5. It automatically submits when you select the letter. No imput button.

I’m guessing this is impossible but if any one knows how to do it then that would be awesome.

Thanks