there is a
ServerName section in httpd.conf which you can change if you want, you will also need to update your DNS to point to the server when its addressed as
http://intranet...
You might want to look into using VirtualHosts, have a look at the bottom of httpd.conf - there is an example config. VirualHosts allow you to have multiple sites hosted on one server, this might be useful if you want the site to respond differently when you call if by a different name.
HTH
Jamie...
PS Remember to restart Apache after chaing httpd.conf! (assuming your installed to /var/lib/apache) /var/lib/apache/sbin/apachectl restart