Thanks Dabhand - a quick search in Google produced the following.
Quote:
1 - Add a new adjustment layer to the layer you want to create a mask for. [Layer>>New Adjustment Layer>>Levels]
2 - Click OK Without making any changes!
3 - In the layers palette, click and drag the adjustment layer under the layer you want to mask. [Note: Click the left hand icon, because the white one on the right won't allow you to drag!]
4 - Hold down the ALT key and click on the line between the two layers to clip them together. [The mouse will change to a double black circle, and when you release the mouse a small arrow will appear on the left of the upper layer]
5 - Finally you can click onto the mask layer on the right of the Adjustment Layer icon. Now when you paint with a black brush on the main image you will reveal the layer below, white if you want to conceal it again. Use low opacity for subtle effects!!
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Will have a fiddle and see if I can blend the two together.