Hi,
This setup is called "manual binding" and you can find an example of how to configure this on the following link:
http://www.cisco.com/en/US/tech/tk648/tk361/technologies_tech_note09186a00800f0804.shtml#se
Bear in mind that the configuration is a little different when DHCP client is a Microsoft
Host or not, the reason is that Microsoft adds a "client identifier" to the MAC address of a
host when sending DHCP requests. The link above explains the difference in configuration in
this scenario (you only add a 01 to the MAC address).
Regards,
Rick.