sharing

i put up a new windows 2000 server in our office. I create a active directory for my client running under windows 98 se. the client can log on the the new windows 2000 server but the problem is in sharing a specific device and a folder, when i goingto share a file to another machine a click on the add then i cant see the specific user that i created on the active directory only the domain admin,domain user, world, and etc. I want to see the specific user. pls help me to solve this problem.. thanks in advanced