DNS wont resolve internal names.

Dear folks,
i have just added a 2003 server to my domain, made it a domain controller, etc., etc. My problem is that when i try to visit a page on the intranet using it’s netbios name, the page fails because it is looking for the page outside the intranet. If i use the IP address, it works fine. Any idea why my DNS server cannot resolve internal names or why it is forwarding internal names to the forwarders. Ping returns the FQDN of this servers but http://netbiosname or FQDN returns “could not be resolved”.
Please help. The DNS is AD integrated and there are 2 secondary DNS servers that loads off the