Dns Server Configuration File Recovery

Hi Experts ,

I hope all of you fine

I have facing one problem in My Dns Server. I am using centos 5.5

In my office some my developer department have a permition to access my dns server configuration file


/var/named/chroot/etc/named.conf


but
by misteck he replace data in /var/named/chroot/etc/named.conf  file and my all configuration in /var/named/chroot/etc/named.conf  are loss so you have a any idea for recover ya undo
my /etc/named.conf file for my dns server



Thanks in Advance
Ranvir Sinh Shaktavat