Add additional IP to Windows 2008 SP2 Cluster

Dears,

I have a 2 node SQL 2008 Cluster 64bit (non r2) on Windows 2008 SP2 64bit (non r2) Server.

I need to add additional IP (different subnet) to the Cluster Quorum Resource. 

Kindly guide me the steps to add the IP ?

Thanks

Tariq