This is my first tutorial. Do not be fooled by its size. File is small because it does not contain sound, and it doesn't contain sound because I think that tutorials should be as small as possible. It's easy to import music in flash, but some people have slow connections. TO COPY CODE, CLICK AT IT instead of selecting it. Tutorial is about preloaders, but it also contains some general programming instructions. Since English is not my first language, feel free to report any spelling\grammar errors, and also any other errors.
edit: improved layout a bit, and corrected some minor mistakes.