sum function and math expressions

Hi,
    The revised problem is as follows:

I would like to evaluate the following mat expression:

       ($max-depth*k) - (($depth+1)*$max-depth - 1)

and use this as value for the colspan attribute to a <td> element.

What this colspan does is fills up the remainder of width of the table when
used on the last <td> in a row when the table rows have variable number of
columns.

Cheers,
Omprakash.V







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