Have fun. Only works properly in Mozilla-based browsers as far as I know, like Firefox. IE gives a weird error message I cannot trace.

No, you cannot save to .j2l (we don't have the source) and the script may be taken offline at times when I'm not around to prevent my server from overheating or people abusing stuff. It may be taken offline in a few days too, I do not intend to do anything further with it or maintain it, it was just a fun little project to learn some javascript when I was too tired to do anything productive.