Display image based on menu item chosen and add menu items above header image

I have been searching for a solution for 2 questions for a while now and haven't really found anything useful thus far.

On the following Website
http://www.stonegateinc.com/

(1) They have setup the menu items so that when a menu item is chosen not only does it update the center column page but it also updates the large blue bar below the top menu with a new image. It also supresses the second lvl menu from appearing.

I feel like there is probably a way to accomplish this in WP with Atahualpa but I have not found the right combination of things to try.

(2) What would be the best way to approach adding a couple of menu options at the very top above header image / logo that would interact with the other 2 menus so that they are all in sync?

I have a pretty through knowledge of CSS and Wordpress and Atahualpa to a point - but this isn't something I have tried to do before. I probably don't need detailed directions but just to be pointed in the right direction on what combination of options/css/plugins I might use to accomplish these tasks.

Does anyone have any ideas in what direction I should head to figure this out?

Thanks in advance for your advice.

Nick B