Question : Domain Controller "remove primary controller from my network"

I have 2 domain controllers on my Network, one is primary (server 2003 ) and secondary (server 2003 R2). I want to remove primary controller from my network. How do I make my secondary controller to be primary?

Answer : Domain Controller "remove primary controller from my network"

mmm......  Do you have depromoted your server???
Do you have only  server as DC????

Thanks