FC8 - Problems with mouse under X

Hi,

I'm having a hard time getting my mouse (i.e. wheel and side-buttons)
to work under Fedora 8.

Here's what I've got in /etc/X11/xorg.conf wrt. mouse:

Section "ServerLayout"
...
            InputDevice    "Mouse0" "CorePointer"
EndSection

Section "InputDevice"
     Identifier     "Mouse0"
        Driver  "mouse"
        Option "Device" "/dev/input/mice"
        Option "Protocol" "ImPS/2"
        Option "Emulate3Buttons" "false"
        Option "Buttons" "5"
        Option "ZAxisMapping" "4 5"
EndSection



However - no wheel function, no side buttons.

Any ideas what could be wrong with my setup?

Thanks in advance for your help,
-ewald