negative amount shown when more expensive attribute selected

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_1x10_piezo_drvr_kit_flat_pack-K10JackPiezoFPDrvrKit.php

BTW have Dynamic Price Updater installed.

Thanks for any help.

In the attribute controller when assigning the option and specifying the cost there is

Prices and Weights and under that
Price

There are 2 blocks the left most can hold a "minus" sign

I realize you can make the price a negative but that's not really what I'm wanting to do.

You would have to write custom code to do what you're proposing, and I suspect it wouldn't be a simple job.

Oh well it's no big deal. Just thought I would see if there was a way to do it. Thanks