Adv. Routing troubles

Question

Im wondering if there is any way to map a port of the router to a local IPort address
lets say computer X sends a messege to my router's non-local IP (65.78.100.100)
Port:8080
can i tell the router to resend that information to Local IP (192.168.1.100) port 8080
as if the router was never there?
because currently i cannot connect to my computer on a wireless network because its a private IP ,... so i need a way to connect to it from the outside world.
if anyone has any ideas I sure could use the help.
~Vitus

Answer 1

This is just a copy of the messege i sent neighbour_devil for any one who is interested in following this topic:
I know i need to forward the port,... but i just cant seem to get it to work.
the port the program is running on is port 8080
its on 192.168.1.20
the router(65.78.122.130) has a page called "port range forwarding" under the "applications and gaming" menu.  I'm assuming it is the same thing because it looks very similair to pictures i've seen of the port forwarding screen
i typed in theese values:
start:8080
end:8080
protocol: both
IP address:192.168.1.20
enable : true
I'm guessing that that forwards ports 8080~8080 to 192.168.1.20 using UPD&TCP protocols, please correct me if i am mistaken.
192.168.1.20 is a static IP.
Hope you can help
~Vitus