function to format floats as money?

Hello,
 I'm curious to know if there is a function available in Postgres 7.0.3
(or 7.1) that will format a float style number as "money". I understand
that the money type is going away in the future, so using a float type
that is sometimes formatted like money seems like a good alternative. So
ideally, I'm looking for a solution that won't go away when the money type
does. :) Thanks!
 -mark

http://mark.stosberg.com/