System halt on low power

[Adam Bell <abell@intersys.com>]

	I'll bet there is a very easy answer to this, so here goes.

	I have a laptop on a LAN which should be on all the time.  HOWEVER, our 
power grid has been known to have trouble, so if the AC should go and the 
batter gets low, I would like the computer to do an orderly system halt 
before things get drastic.  Is there an easy way to do this?

--adam b.