Sorry, hope I don't offend, but I really don't get this. I mean, why a flash tutorial? There's so many sites offering a text tut in this, with varying degrees of difficulty. This type of thing is really, really not suited to a small, noisy .swf. It just becomes hard to follow, difficult to navigate and very messy. Furthermore Newgrounds is really one of the last places people are going to look for a guide to beginners HTML. There were a good few flaws in there too. Off the top of my head you use CSS for coding a background colour, when this can easily be achieved with simple HTML without the need to switch to CSS formatting.
If your profile is anything to go by, though, you're doing well for a 13 year old, despite what I've said.
I hope to see your name above a frontpaged .swf in the next few years.