tot - javascript/base.html
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javascript/base.html 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
    <head>
        <title>Base class for JavaScript</title>
        <script type="text/javascript" src="base.js"></script>
    </head>
    <body>
        <h1>Base class for JavaScript</h1>
        <script type="text/javascript">
            //  TEST
            var object = new Base;
            object.extend({
                value: "some data",
                method: function() {
                     document.writeln("Hello World!");
                }
            });
            object.method();
            // ==> Hello World!

            //  TEST
            var object = new Base;
            object.method = function() {
                document.writeln("Hello World!");
            };
            object.extend({
                method: function() {
                    // call the "super" method
                    this.base();
                    // add some code
                    document.writeln("Hello again!");
                }
            });
            object.method();
            // ==> Hello World!
            // ==> Hello again!
        </script>
    </body>
</html>