DNS problem?

Hello! This past weekend I just upgraded my NT4 PDC to W2K and Active Directory and DNS server of course. I'm in the process of putting the ip address of the new dns server in the network properties of client computers. On my own workstation, when I put the new number in as preferred, I can successfully access the Active Directory tools, but I can't get to our webpage which is the ip of the alternate dns number. If I switch them, the webpage comes up fine but then the AD tools don't work. I have a feeling that the answer lies in the new DNS server I installed. How can I get both to work? Thanks in advance!