Well, that about wraps up this tutorial. Or rather, even though there are still a couple hundred more topics to cover and a thousand more exercises to do, this is where I'm going to stop. We've gone from nothing to a reasonably solid grasp of basic javascript programming... and that was the goal.
We've covered a dozen topics and you did about 50 exercises (I hope). You now have your foot in the proverbial door. I encourage you to expand your knowledge by creating new scripts. Build on what you've learned. Utilize fully the resources at your disposal. Your knowledge and skill will increase in direct proportion to how much scripting you do.
I can't stress enough what a great javascript resource this is. Sure, they have material on a wide range of Internet Related Technologies, but the section on javascript beats all. Ever have a question or problem with javascript? If there's an answer, you'll find it there.