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Sometimes instead of just adding your javascript to the page and having
the browser perform the tasks as soon as the script is read, you might
want your javascript to be performed only upon the detection of a
certain event. A function is a block of code which can be called from
any point in a script after it has been declared. It is basically a
compartmentalized JavaScript designed to accomplish a single task.
Furthermore, JavaScript written into functions will not be performed
until you specifically ask for it. This way you gain complete control of
the timing. Functions are useful because they contribute to rapid,
reliable, error-reducing coding, and increase legibility by tiding up
complicated code sequences. more...
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