Adding the host name to the PgSQL shell

Hi all,

   I work on a development and production server, and I am always
double-checking myself to make sure I am doing something on the right
server.

   Is there a way, like in terminal shells, to change the PgSQL shell's
prompt from 'db=>' to something like 'host@db=>'? I'm on PgSQL 8.1
(server on Debian) and 8.3 (devel on Ubuntu), in case it matters.

Thanks all!

Madi