Practice with this example
One of the best tools to use is the W3Schools Javascript tutorials online.
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Acknowledgements/Further Reference
There are many, many scripting books on the market right now, more than 100 on JavaScript alone. The example here was modified from an old book, JavaScript Bible by Danny Goodman.
There are many places on the web where you can find free JavaScripts to use, but one of them most useful is Dynamic Drive.
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