function testItemChanged(sender) {
   var txtTotal = document.getElementById("test-total");
   var count = txtTotal.value;
   if (count == "") count = "0";
   intCount = parseInt(count);
   if (sender.checked) {
      intCount += parseInt(sender.value);
   } else {
      intCount -= parseInt(sender.value);
   }
   txtTotal.value = intCount;   
}