negative amount shown when more expensive attribute selected

[liefstevens]

I would like to know if there is a way to show a negative amount next to an attribute when a more expensive attribute selected.

so if you have a drop-down with:
attribute 1 + $10
attribute 2 + $40

when attribute 2 is selected attribute 1 would show - $30

Here is a cart that does what I'm talking about (not sure what cart it is) http://www.speakerhardware.com/jack_...oFPDrvrKit.php

BTW have Dynamic Price Updater installed.

Thanks for any help.