User scroll direction preference

[John]

   I have a group with a scroll bar.  Groups with scroll bars, as near as I can tell, don’t support a mouse scroll wheel so I wrote a script (handling the rawKeyDown) to provide my own.

   So far so good.  In OSX, the user can set an OS preference to either scroll the content with the direction of the mouse scroll wheel or scroll in the opposite direction.  How do find out what the user preference is?

Thanks,
John