bind config to view local virtual servers

[news user]

--second post, 1st one never got there... but if it did... well, sorry--

Hi all,
This is what I have:
bind 9.2.2
LAN (172.20.1.x), DMZ (172.20.2.1)
I have a web server in the dmz hosting virtual sites such as:
	www.mydomain.com
	ed.mydomain.com
	foo.mydomain.com
The way my named is setup now, I can only access www.mydomain.com from the
LAN.  I would like to be able to type ed.mydomain.com and get the proper
page.  I read some basic articles on that a while back but nothing very
explicit.

Could anyone point me to some good documentaion on how to do this or a
concrete example?

Thanks a lot.
Ed.