If you are serious about learning the basic principles of Actionscript, I recommend skipping this particular title - (sorry...)
This was the first Actionscript book that I had ever purchased, and I found myself purchasing another Actionscript shortly thereafter. Don't get me wrong, for the few days I was learning things, but as soon as the actual coding begins, alot of the syntax explanation was simply not there leaving me with more questions than answers. Even the live example site documented in the book was kinda weak. I like the "Friends of Ed" titles but you can tell that this was an early work.
The most important keys were missing, syntax and way that the Actionscript interpretor in the Flash Player works - pretty important subjects. Luckily, I found a more "definitive guide" (hint to the title) by Colin Moock that covered the language pretty fully and left me with more answers than questions!