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Is there a good guide about how to make Javascript games on the internet?

Try looking around in WXity forums, where there are countless resources available for web development.

As a side note, Javascript was not intended to be a game scripting language. While you may find that it is possible, it probably isn't the best way to go. I assume you are looking for Javascript game programming because it works in a web browser, correct? In which case, Java should be your first choice, and Flash second. Having the knowledge to make a game in Javascript, IMO, means that you can handle Java, which was intended for web applications rather than web development. However, there is a rather large difference between Java and Javascript. Java is more like C++ in most areas, and Javascript is only reminiscent in its syntax, and while having its many limitations when it comes to real game development, is alot easier to use for its intended task than Java. However, it is still a better choice to go with Java for this area.

I disagree, Java isn't a good choice for actual in-browser software, and is being gradually phased out. Flash is definitely a good choice. Javascript is useful depending on what you want to do, for example, do a search for lemmings + javascript and you'll see what it can do.