Simple Question: How do I color semi-transparent pixels?

Hey all,

First post here! I think this is pretty easy, so hopefully one of you will be able to put me in the right direction!

I have an image that has corners with partially transparent pixels. I would like to make a mouse-over image of this with the same same dimensions, only a different color.

How can I color this image a different color and still have the partially transparent pixels around the edge. Obviously, I would like the semi-transparent pixels to be semi-transparent of the new color.



Thank you in advance!

Have you already tried: Image > Adjustments > Replace Color? (Photoshop CS4) It's really straight forward.