[OS X Emacs] How to specify emacs scroll-bar color on OSX Lion?

[Tony E.Bennett]

It is difficult for me to see the scrollbar slider on Lion - I'd like to
make it stand out more from it's background color.

Is this possible in emacs 24 or Aquamacs?

The scroll-bar face seems to be X11 specific and does not help.

thanks

-- 
--tony