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Rob have a look in one of bluescopes most recent posts. I outlined how to get the colour balance happening using colour pickers. I'll see if I can find the post.
EDIT: Here's the posts.
1. Select the Eyedropper tool. Press the caps lock to make it a precision picker.
2. Image|adjustments|threshold. Slide the slider to the right until only one star is left showing. Hold down your shift key and click on the star. This will place a colour sampler point on the brightest point of your image (don't worry if it doesn't appear, it's there). Then slide the slider to th left until the darkest part of the image is the only part showing (ignore the edges that may need cropping). Shift +click another colour sampler there. Cancel the Threshold dialog.
3. Open the levels dialog box and double click on the left hand eyedropper at the bottom. In the new dialog box set the RGB in the bottom left of the right hand task bar to R15, G15, B20. Click OK. Do the same with the right hand eyedropper (white point) only set the RGB settings to around 245,245,245. Click ok to close that dialog.
4. Select the black point eyedropper and click on the background colour sampler of your image. Select the white point eyedropper and click on the star colour sampler. Click OK. You have not set your black and white points for all colours. BTW when your precision eyedropper is in the correct position over a colour sampler it will disappear so you know you are in the right spot.
If you look at your info pane now you will see that the two colour sampler points will show their RGB values. Now whenever you adjust your curves you can pop back into the levels box and reset the points when they start to get too out of whack. This is a very rough and ready process but surprisingly effective.
Works best if using adjustment layers as it's non destructive but you can use it on the original and go back through the history if you don't like the results.
If you don't already know this process I hope it helps.
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