windows domains

Hi,

Thanks in advance.

Summary-Situation
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Installing windows 2003 Std version in two machines to setup the primary domain and backup domain controllers. The objective is to enable a fail over setup. Load balancing is not demanding but would be fine if can be achieved.

Situation in detail
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There would be about 50 user accounts created in a domain which would act as primary domain. In case of failing primary domain, in worst case if the machine goes off, the back up domain which would also be up and running (live) should take care the responsibility of user logins and net work controls with no manual intervention. Also, when the primary will come back, it should get his roll back.