// add new widget called repeatHeaders 
$.tablesorter.addWidget({ 
    // give the widget a id 
    id: "repeatHeaders", 
    // format is called when the on init and when a sorting has finished 
    format: function(table) { 
        // cache and collect all TH headers 
        if(!this.headers) { 
            var h = this.headers = [];  
            $("thead th",table).each(function() { 
                h.push( 
                    "" + $(this).text() + "" 
                ); 
                 
            }); 
        } 
         
        // remove appended headers by classname. 
        $("tr.repated-header",table).remove(); 
         
        // loop all tr elements and insert a copy of the "headers"     
        for(var i=0; i < table.tBodies[0].rows.length; i++) { 
            // insert a copy of the table head every 10th row 
            if((i%5) == 4) { 
                $("tbody tr:eq(" + i + ")",table).before( 
                    $("").html(this.headers.join("")) 
                 
                );     
            } 
        } 
    } 
});