[CAD_CAM_EDM_DRO] Stepper motors move wrong direction.

Help,

I have a purchased a CNC router, but when I tried using it with a CNC
application all the stepper motors turn the wrong direction.
When I tell the drill to move up, it moves down. When I tell it down,
it moves up.

I was going to try changing the polarity on the stepper motors and see
if they turned the other way, but wanted to find out first if any one
had run into the same problem before?

Thanks for any help in advance,

CrsHawk