file not found errors

I am getting a lot of file not found errors. 

I have traced it down the fact that the site loads with a dns domain name

http://berkshiretoday/sitepages/home.aspx

If I load it with the server address, everything works fine.

http://bufsdshpnt1/sitepages/home.aspx

how can i get it to work with the berkshiretoday name?

Thank you,

Stephen Hathaway

Stephen Hathaway Critical Systems Integrator I