Brightness control for 2 displays

[joshuarayer]

I have the new 21.5 iMac and an Apple 24" Cinema Display. Using the brightness controls on the keyboard only controls the brightness on the cinema display because I have the USB cord plugged into the back of the iMac. If I want to change the brightness control of the iMac display, I have to do it manually with the System Prefs -> Displays panel or unplug the USB cable from the iMac that comes from the cinema display. Is there any software that will make the brightness controls on the Apple Keyboard control both my iMac display and the cinema display at the same time? I know the brightnesses will be slightly different because of the different displays, but I still like to be able to control both displays with the keyboard brightness function key. Thanks!