Mac OS X Leopard - How to change login screen, not login wallpaper.?

I know how to change the Aurora wallpaper that appears at startup, but I am wondering how do you change the grey login screen.



I tried Googling it, but most of the sites I come across tell me how to change the login wallpaper.



If you may produce a path, that would be appreciated.Mac OS X Leopard - How to change login screen, not login wallpaper.?
Don't know what ';produce a path'; means.



The link below explains how to do it. Not an easy task.

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