If you clone a table row element (tr) by means of cloneNode()in IE it loses its table row "identity". This means that with the cloned row cells[], for instance, is no longer available.
Test page Workaround is not included
Reported by: Rein Groot.
Explorer 5-6 Windows, Explorer 7 | Reported on 20 December 2006.
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1 Posted by Jehiah on 20 December 2006 | Permalink
funny I thought I submitted a bug report for this over a year ago. my bad.
http://jehiah.cz/archive/rows-and-cells-in-ie-when-using-clonenode
The workaround is to add the tr back to the DOM (aka append to a tbody) so it has the .cells[] attribute.