SQL failover cluster Migration

Hi Team,
I am having SQL failover cluster in my environment see the below structure,
In my SQL failover I am having 2 Nodes
Node 1:- Windows server 2003 with SQL server 2005 SP2 (Active)
Node 2: -Windows server 2003 with SQL Server 2005 SP2 (Passive)
Now here I am planning to Migrate My Operating system as well as SQL server as below,
Node 1:- Windows Server 2008 SP2 with SQL Server 2008 SP2 (Active)
Node 2:- Windows Server 2008 SP2 with SQL Server 2008 SP2 (Passive)
Can someone please guide me step by step process...

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Regards, Ganesh M <!> Microsoft MPN - Member =========================================================== Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.