test.html

<!DOCTYPE html>
<html>
<head>
<title>Keyboard Example</title>
<script type="text/javascript" src="js/mootools-core-1.3-full-compat-yc.js"></script>
<script type="text/javascript" src="js/mootools-more.js"></script>
<script type= "text/javascript" src="js/sortables.js"></script>
<script type= "text/javascript" src="js/custom.js"></script>
<script type= "text/javascript" src="js/pseudos-keys.js"></script>
<script type="text/javascript">
window.addEvent('domready', function() {
$$('#button').addEvent('click', function(){
    alert('You clicked the button!');
});
  
$$('#in').addEvent('keydown:keys(enter)', function(){
    alert('You pressed the following keys: shift, a and b');
});
});

</script>
<link href="css/form.css" rel="stylesheet" type="text/css"/>
</head>
<body>
 <input id="in" type="text"/><br/>
 <input id="button" type="button" value="hi!"/>
</body>
</html>