jquery make any table sortable

jquery.table.sorter.js

$('th').addClass('order'); //hack

$('table').each(function () {
	var table = $(this);
	var sortOrder = [];

	var cmp = function (order, e1, e2) {
		return order * e1.localeCompare(e2);
	};

	var tail = function (a) {
		return a.slice(1, a.length);
	};

	var cmpArray = function (orders, a1, a2) {
		var cr = cmp(orders[0], a1[0], a2[0]);
		if (cr !== 0 || orders.length === 1) {
			return cr;
		}
		return cmpArray(tail(orders), tail(a1), tail(a2));
	};

	var sortLines = function (col, order) {
		sortOrder.unshift({ col : col, ord : order });
		var orders = sortOrder.map(function (o) {
			return o.ord;
		});
		var orderedTrs = table.find('tr').toArray().map(function (tr) {
			return $(tr);
		}).filter(function (tr) {
			return tr.children('th').length === 0;
		}).map(function (tr) {
			return {
				tr : tr,
				values: sortOrder.map(function (order) {
					return tr.find('td').eq(order.col).text();
				})
			};
		}).sort(function (e1, e2) {
			return cmpArray(orders, e1.values, e2.values);
		}).map(function (e) {
			return e.tr;
		});
		var firstLine = table.find('tr:first').detach();
		table.html('');
		table.append(firstLine);
		orderedTrs.forEach(function (tr) {
			table.append(tr);
		});
	};

	table.find('th.order').each(function () {
		var th = $(this);
		th.html(th.html() + ' (<a class="up">&darr;</a> | <a class="down">&uarr;</a>)');
		th.find('.up').on('click', function () {
			sortLines(th.index(), +1);
		});
		th.find('.down').on('click', function () {
			sortLines(th.index(), -1);
		});
	});
});