Problems Forwarding Port 80 to external host

[Ben Shellrude]

Hello,
I'm just curious if this is possible.
I have a firewall that performs NAT and portforwarding for an internal
webserver.  The idea is to use some code to check that the internal server
is up and running, and if not, to redirect the requests to another host...
However, this secondary host is not located internally or even on the same
network segment as the gateway.  I have not been able to find any help on
forwarding port 80 to an external host.  I'm just curious if any one can
lend me a hand in trying to solve this issue?

Thanx
Ben Shellrude
Sr. Network Analyst
Cybershare and IDYIA Inc.