If you have installation disk near you, you can read CHANGES_AND_HINTS.txt file. There is part which touches your question: search for /etc/X11/xorg.conf in text(cut - oops, that was unrelated).
Also you can achieve same result running xorgsetup in console - a few simple dialogs will help you to do some X configuration, including keyboard layout.
Another way: if you using xfce or kde, you can run their setting manager, which allows to setup keyboard layout on fly.
You should read slackbook(provided with installtion), it can give you a lot of answers.
Last edited by FeyFre; 06-23-2011 at 03:41 PM.