Logitech MX500 for OpenSuSE 10.0

/etc/X11/XF86Config (or /etc/X11/xorg.conf)

Section "InputDevice"
      Identifier  "Mouse0"
      Driver      "mouse"
      Option      "Protocol" "auto"
      Option      "Device" "/dev/input/mice"
      Option      "Emulate3Buttons" "false"
      Option      "ZAxisMapping" "6 7"
      Option      "Buttons" "7"
      Option      "Resolution" "800"
      Option      "MaxHWRepInterval" "100"
EndSection

~/.kde/Autostart/xmodmap
(the other script name, 'xmodmap' in this case, can be named. the script should be assigned executable.)

#!/bin/sh

xmodmap -e "pointer = 1 2 3 6 7 4 5"