In order to define a static members we should call the extend function on the object that represents our Class definition passing over an object that describes the static members we want to define.

<!DOCTYPE html>
<html>
<head>
    <title>static members demo</title>
    <script type="text/javascript" src="mootools-core-1.4.5-full-compat.js">
    </script>
    <script type="text/javascript">
        var Utils = new Class({});
        Utils.extend({
            //static properties
            MAX_SPEED:100,
            //static functions
            sum:function(a,b){return a+b;},
            multiply:function(a,b){return a*b;}
        });
        document.write(Utils.sum(5,2)*Utils.MAX_SPEED);
    </script>
</head>
<body>
</body>
</html>

The following video clip overviews this code sample, executes it and explains it.

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