The only thing I can think of is using a battery backup unit with a voltage regulator. The ones with a voltage regulator cost a little more than $100. They are sold at computer stores since it is best to supply a computer with reasonably constant voltage.

Jeanette Isabelle
_________________________
I'm not sure whose twisted idea it was to put hundreds of adolescents in underfunded schools run by people whose dreams were crushed years ago, but I admire the sadism. -- Wednesday Adams, Wednesday