<script lang="javascript" type="text/javascript">
window.onload = function () {
var spread1 = document.getElementById("<%=FpSpread1.ClientID %>");
if (document.all) {
// IE
   if (spread1.addEventListener) {
     // IE9
     spread1.addEventListener("CallBackStart", CallBackStart, false);
     spread1.addEventListener("CallBackStopped", CallBackStopped, false);
      } else {
     // Other versions of IE and IE9 quirks mode (no doctype set)
      spread1.onCallBackStart = CallBackStart;
      spread1.onCallBackStopped = CallBackStopped;
      }
}
      else {
      // Firefox
      spread1.addEventListener("CallBackStart", CallBackStart, false);
      spread1.addEventListener("CallBackStopped", CallBackStopped, false);
     }
   }
   
   function CallBackStart(event) {
    if (event==null) event = window.event;
       alert("start");
    }
   
   function CallBackStopped(event) {
       alert("stop");
   }
</script>