How can I configure emacs-daemon to kill itself when I shut down my computer

[hap 497]

Hi,

I am using emacs 23.1 on ubuntu 9.10.
And I always use emacs-client to open a file and it will creates a
emacs -daemon when needed.
My problem is everything I shut down my ubuntu environment, it asks me
if I want to kill emacs damon. And I have to manually click 'Close' in
order for the shut down to continue.

Is there anyway to automatic this?

Thank you.