I think Rapmaster hit the nail on the head. ai-tn-usa.com is the primary domain name and would appear to resolve to the webserver. But www.ai-tn-usa.com is a sub-domain of ai-tn-usa.com and the DNS server records need to be updated to reflect this. The "www" sub-domain would be set to point to the webserver. (It's similar to the way that an organization would point mail.company.com to their mail server, or ftp.company.com to their ftp server... even if all those services are running on the same server).

This would be done either via a DNS server the organization in question, or through their service provider, depending on their setup.

If the DNS is being hosted locally and running on MS Windows Server, it can be configured to fall back to WINS resolution if it can't resolve a full domain name reference, so in this case changing the name of the web server to "www" should do the job as Usil pointed out.

Hope this helps...?

KV