As mentioned,
I need to add a new Cluster to an existing SQL 2005 Cluster which sits on top of a Windows 2003 Cluster. I referred to this microsoft document:
http://msdn2.microsoft.com/en-us/library/ms191545.aspx
However, before doing this I had these questions:
1. Do I first need to Install SQL Server 2005 of the new node that I am going to add and then run the procedure mentioned in the link above.
2. Do I have to reboot/restart services on the existing SQL Server node in order to complete addition of the new node.
Thanks in advance