Access Keys for wp_nav_menu()

Hi everyone,

is there a trick, to get access keys to a menu made with the wp_nav_menu function? I tried to do this with this plugin, but it didn’t work!

http://wordpress.org/extend/plugins/wordpress-nav-menus-access-keys/

So, how can I solve this issue?

Thanx for any idea or hint!

Greetz from austria
Achim