Login screen before the actual application in an applet.

Hi all,
I'm really looking for a tutorial or something but I haven't managed to get the wording right in my google searches.
I have an applet that is communicating with a server. Before getting access to the applet as such I would like a login screen. This is not there for the purposes of security but rather which server to work against.
I'm having a bit of problem with the GUI - what would be the best way of doing this?
When you hit the webpage and the applet loads there will be 3 test fields and 3 input boxes - one being a password box. and finally a OK button.
The OK button will call a function I already have that will verify that the credentials are OK and pass back a yay or nay - if I get a nay I want to stay on the login page.
If I get a yay - and this is where I don't know what to do. I want a complete GUI redraw of the new components.
I have tried to put all components into the one window and hide-and-show them as required but this just turns into a complete mess. I have the second window already - and I'm quite happy with it so I really want a brand new login window and switch from one to the other without having to resort to the messy hack I'm currently using.
I'm sure I'm missing something pretty basic here so if someone could please guide me towards a tutorial I'd appreciate it.
thanks,
Dan

That's exactly what I was looking for.
thanks!

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