Different Login Layout For Admin Panel Depends On Contoleer

I m managing forntend and backend in one server…

my frontend is http://www.example.com

and baclend is http://www.example.com/admin/

i have used user login authentication

how can i have different layout for of login form—> both design will be different

so if i write something like http://www.example.com/useradmin/ will display proferry theme…here authentication process will be same.

How can i do with use of controller

i have created controller UseradminController and defined theme in that but it gets redirect to

http://www.example.com/admin/user/login… and displaed default form … iwant

http://www.example.com/useradmin/user/login-->new theme

if any one knows how to do…plz provide me with some sample code if possible

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