internal server viewing issues

Hi.

Just setup WP/MySQL/php on a local server in my home. While editing and making changes to the design/theme I asked a friend to view and give feedback — I’m having an issue with being on the same network as the blog is stored and cannot view it internally. I use elizabeth.rni.local to view my page while others use http://www.elizabethashwood.com/. Is there a way in the options panel to manipulate the addresses such that — the page shows for external viewers and also for me? I read through the support files and closest thing I found to this same issue I’m having was : http://wordpress.org/support/topic/16292.

In the options panel — when I set the blog URL and wordpress location to http://www.elizabethashwood.com/ it looks great/complete to external viewers — however, it appears “bare boned” to me and I have lots of difficulties getting the wp-admin page to load. I believe this is an issue because of our firewall perhaps?

Any advice or insight anyone has would be wonderful, thanks in advance.