My Joystick Doesn't Seem To Have An Axis 3

I just purchased a Joystick called LOGITECH ATTACK 3 shown below:


http://www.itc.ua/img/dpk/2003/10/logitech.jpg


In Battlefield 2 when trying to calibrate it:

Moving it left/right - Axis 0
Moving it forward/backwards - Axis 1
Moving the little scroll button below the joystick - Axis 2

There doesn't seem to be any Axis 3 though and on this page (which is what I'm trying to base my settings on) there is Axis 0,1,2,3 - http://intel.planetbattlefield.gamespy.com/bf2/joystick.html

Any help on this would be appreciated, thanks.


HK