function odometer (n, ndigits)
{
    var s = n.toString();
    while (s.length < ndigits) s = '0' + s;
    document.write ('<span style="white-space: nowrap">');
    for (var i=0; i<s.length; ++i)
    {
        var c = s.charAt(i);
        document.write ('<img src="odometer/', c, '.png" width="15" height="20" alt="', c, '">');
    }
    document.write('</span>');
}