I have two DCs in my network running win2k3. How can I make the second
one the schema master? would appreciate the help.

There can be only one schema master in an AD forest.  However, if you are
asking how to transfer the schema master to the second DC, see below.

FSMO movement:
http://support.microsoft.com/default.aspx?scid=kb;en-us;255690&Product=win2000

FSMO placement:
http://support.microsoft.com/default.aspx?scid=kb;en-us;223346

Seizing roles.  You don't need (and don't want) the original server online
when seizing an FSMO role.  To seize the roles, you run ntdsutil and bind to
another working DC  and then seize from the DC that is no longer up (and
never should come back up ever again after the roles are seized).

Using Ntdsutil.exe to seize or transfer FSMO roles to a domain controller
http://support.microsoft.com/?id=255504

Flexible Single Master Operation Transfer and Seizure Process
http://support.microsoft.com/?id=223787

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