There is, what seems to me, a simpler way. Create a file in your home directory called ".Xmodmap" containing the following:
or just add the above to your currently existing .Xmodmap file.
Then run this at the start of your X session:
Code:
xmodmap /home/$USER/.Xmodmap
Thats all assuming that you have a three button mouse with a wheel.
I use a left handed mouse and the above does it for me.