How to reconfigure Wacom Tablet to larger screen

I have an Intuos 2, 12x12 that used to be configured to my powerMac G4.

I moved it to my Macbook pro 17" which has an extra large screen.

The Wacom is configured for the smaller screen, so I cannot make a smooth line with the curser pen all across the surface, but have to back scroll several times in a sweeping motion to get to the other side of the tablet.

I cannot find a window to reset it.

I think the issue isn't the screen size, but the format (the fact that it's a widescreen format, not a square format). I'm not really sure how that can be corrected. Normally, wacom's options are in their system preference pane. You may wish to play with both 'screen area' and 'tablet area' under Mapping. With the pen selected.

This is from an intuos 4 panel, so it may well differ.