auto disable touchpad when using usb mouse

I am looking a method to auto disable touchpad of notebook when using external usb mouse.
And auto enable touchpad after i remoce the mouse.
I try synaptics touchpad driver version 10 for xp 32bit, it do not had this function.
But as i know synaptics touchpad driver 8.3.7 seems can do it, but i cannow download it from the internet.
Any idea can i download this software or any idea can i fix my issue? Many thanks.
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