Bill, I put a quick veg file (done in Pro 8) together to show you what I mean to and let you dissect it at your leisure.
The veg file and image are at
https://dl.dropbox.com/u/20488019/LogoBlur.zip
I blurred both the book title and logo to show you that you can do more than one mask at a time on the same image.
Let me know if you still have questions after looking at it.