Packet redirect

[Tom Servo]

Hey-
I have a freebsd gateway machine that runs ipfw and nat for my home network
and I want to add a rule that redirects VNC packets through the gateway to
my windows machine so that I can VNC to my home machine to do some stuff.
How should I phrase the rule correctly without screwing up the natd service?
I am guessing it should go something like this:
ipfw add 1000 divert 8888 ip from any to 192.168.0.253:5800 via ep1
Is this correct?  I need it to only redirect packets for the VNC port.
Thanks
-ts

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"On really romantic nights of self, I go salsa dancing with my confusion."