setting background color

[Pierre Kleiber]

I would like to set the background color for frames in which I am
running R to something diffent than the my usual emacs background.
I have the following in my .emacs file:

;; enable ESS
(load "/usr/local/lib/emacs/site-lisp/ess/lisp/ess-site")
(add-hook 'ess-mode-load-hook
	 (setq ess-loop-timeout 1000000)
)
(add-hook 'ess-mode-hook
         (set-background-color "aquamarine1")
)
(setq ess-source-directory
       (lambda () (concat ess-directory ""))
)

The problem is that all emacs frames are set to aquamarine1 whether
I have done "M-x R" or not, and it matters not which of the ess hooks
I use. The background seems to be set at the time the hook is defined,
not when it is invoked (or when I think it should be invoked).  Am I
misunderstanding something?... and is there a better approach to try?

Other possibly relevant data:  ess-5.1.8;  GNU Emacs 20.4.1
(i386-redhat-linux-gnu, X toolkit) of Sat Sep 25 1999 on
porky.devel.redhat.com

Thanks, Pierre

-- 
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Pierre Kleiber             Email: pkleiber at honlab.nmfs.hawaii.edu
Fishery Biologist                     Tel: 808 983-5399/737-7544
NOAA FISHERIES - Honolulu Laboratory         Fax: 808 983-2902
2570 Dole St., Honolulu, HI 96822-2396 
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