Not good
Tsk, Tsk, Tsk. Never make a tutorial, when you don't know the stuff yourself. Never give ActionScript codes in a tutorial, if your not going to explain what each part of it does.
You just gave a code not at all telling how it works. How do you expect people to learn them without an understanding?
Also, with the quality buttons. You don't use label a button "Best" if it's high quality, since there's another quality above High, called: "Best". Although it's only available if you use the ActionScript to turn it on. So you'd have 4 buttons, and there should be best, and high.
When you had the code to move a MC via the arrow keys. You should ALWAYS explain a long code like that, if you've memorized that code, then that's good for you. But, even though I have learned it, you should always explain something long like that.
A tutorial is something that should "TUTOR" you, not just give you a bunch of stuff to memorize, or copy/paste.