Configuring 4-button mouse

OS is Red Hat 9.0

I have a USB logitech trackball with 4 buttons.
The smaller right-hand button is being mapped the
same as the larger right-hand button.

xev calls them both "button 3"
Below is my XF86Config entry for the mouse.
Maybe some can tell me what modification is needed.
thank
tim

## entry follows
section "InputDevice"
      Identifier "Mouse0"
      Driver "mouse"
      Option "Protocol" "IMPS/2"
      Option "Device" "/dev/input/mice"
      Option "ZAxisMapping" "4 5"
      Option "Buttons" "4"
      Option "Emulate3Buttons" "no"
EndSection

-- 
Tim Johnson <tim@johnsons-web.com>
      http://www.alaska-internet-solutions.com
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