DNS Problem

I have a RedHat 7.0 system acting as my Internet gateway for my LAN.  I connect 
using an ISDN line.  I own a domain www.davidsconsultants.com.  I recently 
changed hosting services.  I am now running into the following problem.

If I connect to my ISP using a Windows 2000 machine and ping the address 
www.davidsconsultants.com I get the correct IP address as registered in the 
DNS.  When I connect using the Linux box the ifup-post script was over writing 
my resolv.conf file with the wrong DNS servers.  I took out the part of the 
script that overwrites the resolv.conf file.  Now when I test the DNS 
resolution using host www.davidsconsultants.com I get the correct information.  
However, I am still unable to connect to the new host using Netscape.  Nor can 
I retrieve my mail.

Can anyone explain to me why even though host is returning the correct 
information Netscape is not going to the correct site?