Sort table by arbitrary column with javascript

sort.js

    function sortTable(table, col, reverse) {
        var tb = table.tBodies[0],
            tr = Array.prototype.slice.call(tb.rows, 0),
            i;
        reverse = -((+reverse) || -1);
        tr = tr.sort(function (a, b) {
            return reverse
                * (a.cells[col].textContent.trim()
                        .localeCompare(b.cells[col].textContent.trim())
                );
        });
        for(i = 0; i < tr.length; ++i) tb.appendChild(tr[i]);
    }

    // Call the function 
    sortTable(document.getElementById('statisticsTable'), 3, true);