Javascript? There are plenty of table sorters out there:
- http://tablesorter.com/docs/
- http://kryogenix.org/code/browser/sorttable/
- http://friedcellcollective.net/js/SortedTable/
- http://www.leigeber.com/2009/03/table-sorter/
- http://www.millstream.com.au/view/code/tablekit
