getting data using cell().data() not working for thead and tfoot

Hi all,

I'm trying to get data from a specific cell in my tfoot. However, trying to get it using cell().data() and an id-selector does only work for the tbody. See http://live.datatables.net/riwutife/1/edit for an example.

In my example, how could I get data from cell with id='foot'?

Cheers
Seb.