New User, Need some help guys and girls

Hello all, I have ask loads of people this including microsoft (who are crap).
what I am looking for is some software that will let swap a mouse around so down is up. Its for one of my disabled customers and i have no idea how to it.
I know that Logitech`s mouse ware will do it but you only get that option for logitech mice. any idea would be great.

Yep heres a little program that does it.
http://www.slinkycity.com/mouse-reverse-trick.html
Just put the app in the startup folder or as a service and it will load up every time.

Stop this by ctrl-alt-del and ending the process reverse.exe

Thanks mate.