(Alternative approach: mask the area of interest and apply a soft blur effect to the background - grab yourself a copy of Gimp and play with some of the tutorials out there - good fun)
Believe it or not, I actually just figured that out on my own. I use Paint.net, which is considerably simpler than Gimp, but it has tools I am smart enough (for the most part) to use.
I didn't do as careful and clean a job as Mark did, but I have the concept of how to do it.
tanstaafl.
edit: hmmm... I see Mark added a lot more unfocus than I did. I like his better.
