$(document).ready(function() { 
    $.tablesorter.addParser({
        id: "fancyNumber",
        is: function(s) {
            return /^[0-9]?[0-9,\.]*$/.test(s);
        },
        format: function(s) {
            return $.tablesorter.formatFloat(s.replace(/,/g, ''));
        },
        type: "numeric"
    });
    $(".sortTable").tablesorter({
        widgets: ['zebra'],
        widgetZebra: { css: ['rowColor2','rowColor1'] },
        sortList: [[0,0]],
        headers: { 
        	6: {sorter: 'fancyNumber'}
        }
    }); 
});