How to create user level themes like Orkut?

Hai ,

I am doing a community website. Assume that I am giving an option to all my users开发者_StackOverflow to choose a theme. That we happen see on websites like Orkut , Gmail etc..Actually we can keep only one theme inside the web config right ?. During dynamic change all the other user's themes will also change. How to avoid this?

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Your friend is user profile.

http://msdn.microsoft.com/en-us/magazine/cc163724.aspx

You could find many more samples online