Setup DNS in Win2K for ISP

I have a test Win2K network and I have DNS setup and running fine for internally. If I put the clients DNS as my ISP then they have no problme getting to the web. But if I put the DNS as my networks DNS then the internet does not work. I do not haveany records for my ISP in my DNS setings. That is my problem.

How do I setup my DNS to use my ISP’s DNS for web requests?