Javascript
// 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(""))
				
				);	
			}
		}
	}
});
// call the tablesorter plugin and assign widgets with id "zebra" (Default widget in the core) and the newly created "repeatHeaders"
$("table").tablesorter({
	widgets: ['zebra','repeatHeaders']
});
Demo
	
		
			| Name | Major | Sex | English | Japanese | Calculus | Geometry | 
	
	
		
			| Name | Major | Sex | English | Japanese | Calculus | Geometry | 
	
	
		
			| Student01 | Languages | male | 80 | 70 | 75 | 80 | 
		
			| Student02 | Mathematics | male | 90 | 88 | 100 | 90 | 
		
			| Student03 | Languages | female | 85 | 95 | 80 | 85 | 
		
			| Student04 | Languages | male | 60 | 55 | 100 | 100 | 
		
			| Student05 | Languages | female | 68 | 80 | 95 | 80 | 
		
			| Student06 | Mathematics | male | 100 | 99 | 100 | 90 | 
		
			| Student07 | Mathematics | male | 85 | 68 | 90 | 90 | 
		
			| Student08 | Languages | male | 100 | 90 | 90 | 85 | 
		
			| Student09 | Mathematics | male | 80 | 50 | 65 | 75 | 
		
			| Student10 | Languages | male | 85 | 100 | 100 | 90 | 
		
			| Student11 | Languages | male | 86 | 85 | 100 | 100 | 
		
			| Student12 | Mathematics | female | 100 | 75 | 70 | 85 | 
		
			| Student13 | Languages | female | 100 | 80 | 100 | 90 | 
		
			| Student14 | Languages | female | 50 | 45 | 55 | 90 | 
		
			| Student15 | Languages | male | 95 | 35 | 100 | 90 | 
		
			| Student16 | Languages | female | 100 | 50 | 30 | 70 | 
		
			| Student17 | Languages | female | 80 | 100 | 55 | 65 | 
		
			| Student18 | Mathematics | male | 30 | 49 | 55 | 75 | 
		
			| Student19 | Languages | male | 68 | 90 | 88 | 70 | 
		
			| Student20 | Mathematics | male | 40 | 45 | 40 | 80 | 
		
			| Student21 | Languages | male | 50 | 45 | 100 | 100 | 
		
			| Student22 | Mathematics | male | 100 | 99 | 100 | 90 | 
		
			| Student23 | Languages | female | 85 | 80 | 80 | 80 |