I'd like to scroll up and down, not side to side

[bkorb]

my xorg.conf mouse section:

Section "InputDevice"
Driver "mouse"
Identifier "Mouse[1]"
Option "Buttons" "15"
Option "Device" "/dev/input/mice"
Option "Name" "Microsoft Wireless Keyboard and Mouse"
Option "Protocol" "explorerps/2"
Option "Vendor" "Sysp"
Option "ZAxisMapping" "4 5"
EndSection

This looks pretty close. The bottom of the mouse reads:

Wireless IntelliMouse Explorer 2.0

openSuSE 11.0
Linux bkorb 2.6.25.5-1.1-default #1 SMP 2008-06-07 01:55:22 +0200 x86_64 x86_64 x86_64 GNU/Linux

Addendum: I have no /dev/input/mice device.
The mouse does work. The scroll wheel does move stuff from
side to side. But no /dev/input/mice. I do have /dev/input/mouse0,
is that close enough? Should I change this entry?