Moving a layer's alpha channel into layer mask

(CS3)
I have a raster layer that has some semi-transparent pixels. I'd like to make the layer itself fully opaque, and move the contents of its alpha channel into a layer mask. How would I go about doing this? (If possible, merging the alpha channel with what I have already placed into the layer mask.)
Thanks!

kopo88 wrote:
(CS3)
I have a raster layer that has some semi-transparent pixels. I'd like to make the layer itself fully opaque, and move the contents of its alpha channel into a layer mask. How would I go about doing this? (If possible, merging the alpha channel with what I have already placed into the layer mask.)
Thanks!
Copy the alpha channel into your clipboard, then paste it into the mask. To paste into a layer's mask, alt click the mask to make the mask the focus then ctrl v to paste. To remove focus, alt click on the mask again or click on another layer. As to how to mix the two, you could probably do it using calculations.

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