You'd need to configure an internal DNS server to point to the inside address of whatever you're forwarding from the outside. For example:
Outside users go to:
www.gotomydomain.com -> public address: 5.5.5.5 -> forwarded to internal: 10.10.10.10
Inside users go to:
www.gotomydomain.com -> internal dns points to 10.10.10.10
If you don't have a lot of clients, you can edit their hosts file but this becomes a pain for a lot of entries.
I hope I'm understanding your question.....
John
HTH,
John
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