How do I set up WHM/cPanel behind a router?

I am trying to host a small website (maybe 2) behind a router. I need the router because I have 2 computers in my home. it's a TrendNET TEW-651BR router. On the server, I have CentOS 5.6 and have WHM and cPanel set up. I also have a static IP and port 80 unblocked from my ISP. When i go to set up the site, it gives the site the local intranet address of 192.168.10.103. This doesn't seem normal. Can anyone help with this? Give me step by step instructions or point me to the best place to go for the instructions? Thanks!