JavaScript Table Sorter

  <script>
        (function(document) {
        'use strict';

        var LightTableSorter = (function(Arr) {

            var _th, _cellIndex, _order = '';

            function _text(row) {
                return row.cells.item(_cellIndex).textContent.toLowerCase();
            }

            function _sort(a, b) {
                var va = _text(a), vb = _text(b), n = parseInt(va, 10);
                if (n) {
                    va = n;
                    vb = parseInt(vb, 10);
                }
                return va > vb ? 1 : va < vb ? -1 : 0;
            }

            function _toggle() {
                var c = _order !== 'asc' ? 'asc' : 'desc';
                _th.className = (_th.className.replace(_order, '') + ' ' + c).trim();
                _order = c;
            }

            function _reset() {
                _th.className = _th.className.replace('asc', '').replace('desc', '');
                _order = '';
            }

            function onClickEvent(e) {
                if (_th && _cellIndex !== e.target.cellIndex) {
                    _reset();
                }
                _th = e.target;
                _cellIndex = _th.cellIndex;
                //var tbody = _th.offsetParent.getElementsByTagName('tbody')[0],
                var tbody = _th.offsetParent.getElementsById('body2')[0],
                    rows = tbody.rows;
                if (rows) {
                    rows = Arr.sort.call(Arr.slice.call(rows, 0), _sort);
                    if (_order === 'asc') {
                        Arr.reverse.call(rows);
                    }
                    _toggle();
                    tbody.innerHtml = '';
                    Arr.forEach.call(rows, function(row) { tbody.appendChild(row); });
                }
            }

            return {
                init: function() {
                    var ths = document.getElementsByTagName('th');
                    Arr.forEach.call(ths, function(th) { th.onclick = onClickEvent; });
                }
            };
        })(Array.prototype);

        document.addEventListener('readystatechange', function() {
            if (document.readyState === 'complete') {
                LightTableSorter.init();
            }
        });

        })(document);
    </script>