allowing connections from additional hosts without a restart?

Greetings,
Is it possible to allow TCP/IP connections from additional hosts (IPs)
without restarting postgresql?

The issue i'm having is that i've got a postgresql-7.4.6 box that has
a DB running on it for a j2ee based application on a separate server.
Now i need to add an additional DB for a different server, but I can't
afford any down time to restart postgresql for the changes in
pg_hba.conf to take effect.

Is there any workaround that doesn't require a restart?

thanks!

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L. Friedman                                    netllama@gmail.com
LlamaLand                       http://netllama.linux-sxs.org