[jQuery] tableSorter question: how to disable the last header?

[jQuery] tableSorter question: how to disable the last header?


Hi Guys,
I would like to know, how to disable the last header. I don´t the last
column with the option to sort.
I have tried it (see below) but withou success.
var totalHeaders = ( $('table th').length - 1);
    $('table').tablesorter({
            headers: {
                totalHeaders : {
                        sorter: false
                }
            },
            widgets: ['zebra']
    });
OR
    $('table').tablesorter({
            headers: {
                -1 : {
                        sorter: false
                }
            },
            widgets: ['zebra']
    });
Some suggestion?
Regards