allowing only alphabets in text box using java script

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<html>
<head>
    <title>allwon only alphabets in textbox using JavaScript</title>
    <script language="Javascript" type="text/javascript">

        function onlyAlphabets(e, t) {
            try {
                if (window.event) {
                    var charCode = window.event.keyCode;
                }
                else if (e) {
                    var charCode = e.which;
                }
                else { return true; }
                if ((charCode > 64 && charCode < 91) || (charCode > 96 && charCode < 123))
                    return true;
                else
                    return false;
            }
            catch (err) {
                alert(err.Description);
            }
        }

    </script>
</head>
<body>
    <table align="center">
        <tr>
            <td>
                <input type="text" onkeypress="return onlyAlphabets(event,this);" />
            </td>
        </tr>
    </table>
</body>
</html>

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