Convert String to Title Case in JavaScript

<!DOCTYPE html>
<html>

    <body>
        <script>
        var str = 'ramakrishna basagalla';

        function ConvertToTitleCase(str)
        {
            return str.replace(/\w\S*/g, function (txt)
            {
                return txt.charAt(0)
                    .toUpperCase() + txt.substr(1)
                    .toLowerCase();
            });
        };
        alert(ConvertToTitleCase(str));
        </script>
    </body>

</html>