Untitled

<html>
<head>
    <script type="text/javascript">
        function doSomething(event, chkbox)
        {
            if (event.shiftKey)
                alert('Shift key was pressed while picking ' + chkbox.value);
            else
                alert('You picked ' + chkbox.value);
        }
    </script>
</head>
<body>
    <h3>Pick a Color</h3>
    <input type="radio" name="myColors" onclick="doSomething(event, this)" value="Red" /> Red<br/>
    <input type="radio" name="myColors" onclick="doSomething(event, this)" value="Green" /> Green<br/>
    <input type="radio" name="myColors" onclick="doSomething(event, this)" value="Blue" /> Blue<br/>
</body>
</html>