請教一個關於DNS的問題

i have a private network behind a router using NAT.

I have a Win 03 running as my DNS server and as my web server. My DNS server resolves internal names and all other requests are forwarded to a public DNS server. I can access my web server from outside of my private network using my domain name(www.xxx.com) and can access the web server from inside of my network by using an internal ip.

How do i add a record to my internal DNS server so that i could just type in www.xxx.com to access my web server inside my private network?

thanks a lot!