HennerM

if (typeof grades == "undefined") {
  var grades = {};
}
$("#ctl00_ctl00_ctl00_MainArea_MainArea_ContentArea_gvGrades tr").each(function() {
	var name = $(this).find("td:nth-child(4)").text().trim();
	var value =  parseFloat($(this).find("td:nth-child(3)").text().trim());
	if (typeof grades[name] == "undefined") {
		grades[name] = value;
	} else {
		grades[name] += value;