Check out this link I think what you are after is using the xmodmap command.
http://www.glaurung.demon.co.uk/info...500.howto.html
Not sure howto structure the command but search here for xmodmap pointer and also on google as well.
Brian1
Distribution: RHEL 5.1 with Pieces of this and that.
Kernel 2.6.23.9, KDE 3.5.8 and KDE 4.0 beta, Plus Development src.rpm, ATI fglrx64_7_1_0-8.433-1 rpm with 3D and DRI working.
Acer 5100-5840 with webcam, ati, sdcard reader, sound, atheros based wireless, all working. Only thing not working is the memory stick reader.