When you first try to run a Javascript on your web page it is quite likely that it wont work the way that it is supposed to. You may get an error message that gives you a clue as to what happens or the script may just not appear to do anything.

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Perhaps you are just looking for information on where to get pre-built Javascripts to use on your site. Alternatively, you may want to learn how to write your own javascripts. In either case the two things that you most definitely need are a web editor and one (or more) browsers.

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