OS11 Port Forwarding how do I do it ?

I am running a openSUSE 11 on server.

I have set it up for DHCP and act as a Gateway.

The server as 2 nic, eth0 for internal and eth1 connected to my cable modem.

I have setup Virtual Box which is using the internal addresses (NAT) 192.xxx.xxx.xxx

I have setup a website on the Virtual Box and would like to access it from the Internet / From work.

I need to know howto forward traffic on port 80 to the website on the Virtual Box.