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1. jQuery tablesorter
http://tablesorter.com/docs/
2. Table sorting with Prototype
http://tetlaw.id.au/view/blog/table-sorting-with-prototype/
3. Sorttable
http://www.kryogenix.org/code/browser/sorttable/
4. Table Sorting Javascript
http://yoast.com/articles/sortable-table/
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