About Proxy server

Hi,
I have windows 2000 adv. server and 10 windows 2000 prof. clients.I want to share internet through NAT.I am using dialup connection so i don’t hv any static ip.I created demand dial interface and define a default static route.Now i want my clients can share internet.My clients are getting IP from my DHCP server.How i configure my clients to share internet and demand dial.
Anurag.