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A trivial example of a JavaScript URL is javascript:alert("Hello World!")
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A JavaScript URL may appear anywhere an ordinary URL is expected: <A HREF="javascript:history.back()">Previous Page</A>
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Note must use <A HREF=" javascript: void(anyoldfunction())" > if you do not want link to be invoked!
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Use HREF="javascript: void(0)" if no action at all -- used if real action from onclick or other event handle for link
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Navigator even has a mini-scripting environment invoked by typing javascript:into the browser's location text field
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This is now (NN4.5) used to display error messages as a console instead of alternative (and clumsy) stream of windows (one per error ....)
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