I have a webserver that loses its Serving ablity when I connect my GPRS modem

Hi everyone,

Maybe somebody has the miracle advise that can save me, I am most confused. I have a ADSL account that I'm using to host an apache web server. I use Dyna DNS to insure the IP is always updated even though it is dynamic. Thing is I have a program that requires the use of the MTN (cellphone) network so I use my GPRS modem and connect it gives me a new IP (cool) however now no one can connect to my webserver???? My ADSL router has port forwarding on it for the Port 80 address and my internal IP 10.0.0.13 is the destination. What is it that can cause this port forward not to work when I connect to the MTN network? surely my IP for the ADSL is still valid and if a person connects either via the name or IP they should come through the router to my webserver? What I need is to have both connections why servering my apache on the ADSL connection I must be able to talk to the other devices on the GPRS network. I thought about network bridges think this will help? Advice - any is welcome

Thank you for listening please post ! Anything is good right now