Creating additional domain

Hello there, this is my first post here and I do appreciate if someone can help me in this scenario.

I have a DC running Windows server 2008 Standard in the HQ, I have a remote location connected to it through a VPN, some times the connection drops, and this prevent the remote location computers to log in, stops sharing, because there is no authentication from the DC anymore, so users must wait until the connection come alive again, I have a server in the remote location running windows server 2003, with some applications installed on.

what I want to do is to promote this 2003 server to be additional domain to help when the connection to the DC down.

my question is:
is it possible to promote windows server 2003 to be additional domain in server 2008 environment ? and if it is possible - how to do so?

thanks ...
 
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