How to determine Cell Position

[RevList]

I have a Scrolling Table Field that is populated with  tab delimited rows
of data
Just above that table field, I have a second, 1 row table field that lists
the column titles.
The data and the column titles change as I import data into the fields.

What I would like to do is sort the large table of data based on which
item is clicked on in the title table row.
My question is.
Is there a method that will tell me which cell column (item) I am clicking
on in a table row?

Thanks in advance.

Stewart.

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