disabling touchpad on notebook

Hello all,

I have a Dell Inspiron 4000 laptop running FC3.  I'd like to disable the 
touchpad and use only a microsoft USB wheelmouse.  

Currently when I plug the USB mouse in, it works fine, however the touchpad is 
also working.

Does anyone know what to do with the xorg.conf to disable the touchpad?

Below are what I believe to be the relevant sections of the xorg.conf file:

Thanks,
d


Section "ServerLayout"
        Identifier     "single head configuration"
        Screen      0  "Screen0" 0 0
        InputDevice    "Mouse0" "CorePointer"
        InputDevice    "Keyboard0" "CoreKeyboard"
        InputDevice    "Synaptics" "AlwaysCore"
EndSection

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

Section "InputDevice"
        Identifier  "Synaptics"
        Driver      "synaptics"
        Option      "Device" "/dev/input/mice"
        Option      "Protocol" "auto-dev"
        Option      "Emulate3Buttons" "yes"
EndSection