[xsl] xsl:sort - sorting according to user selection

I have the following problem.
I have an xsl file that displays a table. I want each column heading in the
table to generate a sort ie if the user clicks on heading 1, the data for
the whole table will be sorted according to column 1, if heading 2 then the
whole table is sorted according to column 2 etc.
Obviously, I could do this by having each column linked to its own xsl file
which would perform the sort. However, rather than using multiple xsl files,
I would like to do it by using my single xsl file and getting it to call
itself (when a heading is clicked) and to use some kind of parameter that
will tell it how to do the sort.
Any ideas?

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