+4  A: 

Ext is well-designed and complete, it is one of the few libraries designed to do the majority of what you want. I would recommend simply enhancing what is there in Ext.

Multi-column has already been done:

http://www.extjs.com/forum/showthread.php?t=48324

It's very possible that ExtJs has the ability to reuse your sorting code as well.

altCognito  2009-04-08 23:43:20

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