Hi Bob,
Yeah, that was a hard one for me, too. Mark didn't give any of the colors he used (not even for the gradient itself). I believe he did this for a reason - here at PSG I always see Mark telling people to experiment, to follow a tut but to try different things themselves. I believe that's why he did this.
To compensate for this I copied the screenshot, pasted it into the Photoshop worksurface, and used the Eyedropper Tool to select a color from the little gradient bar in his screenshot - that got me a color close enough for government work.
I did the same thing for the gradient in Gradient Overlay. You can either do the copy/paste as I mentioned above or you can use a color picking program.
I use a neat little app called Pixie. This is a good little tool to help you pick out colors from backgrounds, images, etc. I use this one all the time. You can get it here:
http://www.nattyware.com/pixie.html