Apache VirtualHost configuration for domain under nameserver bind9

I configured DNS (bind9) and Apache in FreeBSD 4.7 (IP: 192.168.1.1).
My server name on FreeBSD - myserver.mydomain.com
This server configuration:

1. /etc/resolv.conf
domain mydomain.com
nameserver 192.168.1.1

2. Bind config:
I have domain:
mydomain.com
This domain hosts:
server (192.168.1.1) - server and DNS-server (FreeBSD)
site1 (192.168.1.1)
site2 (192.168.1.1)
xpcomp (192.168.1.10)

3. Apache config (httpd.conf):

NameVirtualHost myserver.mydomain.com

<VirtualHost site1>
ServerName site1.mydomain.com
ServerAlias site1
DocumentRoot /usr/local/proj/site1/html
ErrorLog /usr/local/proj/site1/_log/error_log
CustomLog /usr/local/proj/site1/_log/access_log common
</VirtualHost>

FreeBSD is a Virtual Mashine (based on VMWare Workstation 4) under WinXP.
In Windows XP Lan config I wrote:
DNS -> 192.168.1.1.

My Computer settings:
Name: xpcomp
Workroup: MyWorkgroup
DNS suffix: mydomain.com

When I in browser load my local site with url http://site1/ I want, that
browser automatically to the end of base url addes domain name in bind config.
Examples:
http://site1/ -> http://site1.mydomain.com
http://site1/test/index.html -> http://site1.mydomain.com/test/index.html

How can I make this think? What config i need to correct: apache, bind or
something another? (I can show my bind config files)