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This is a technique I developed recently that allows me to write a single set of server-side code to validate data submitted via an HTML form that can then be executed via AJAX if the user's browser has JavaScript enabled or executed server-side via a regular form post if JavaScript has been disabled. It makes use of the jQuery JavaScript library and a particular jQuery plug-in to make it easy to write the JavaScript functions involved. My example uses ColdFusion as the server-side language, but it could just as easily have been PHP or something else.