Apple server gurus? I have a Mac OSX Snow Leopard server question. How to be able to view a company's externally hosted website from inside the company?

I inherited a company using Mac OSX Snow Leopard server. We moved the website away from MobileMe and into an environment that offers PHP etc.

Although the site shows up correctly outside of the company, internally it looks to the MobileMe page and shows an error.

I need to change the www record to reflect the change. Where do I do this on OSX Server?