Index: lams_monitoring/web/grouping/chosenGrouping.jsp
===================================================================
diff -u -r5ddcb21ac9ffd7a727f6c881be01311d8ee50b3a -r1d600420fe2b9f8a0c7247f5e83e015baca02601
--- lams_monitoring/web/grouping/chosenGrouping.jsp	(.../chosenGrouping.jsp)	(revision 5ddcb21ac9ffd7a727f6c881be01311d8ee50b3a)
+++ lams_monitoring/web/grouping/chosenGrouping.jsp	(.../chosenGrouping.jsp)	(revision 1d600420fe2b9f8a0c7247f5e83e015baca02601)
@@ -238,8 +238,11 @@
 						addgrpRequest = new ActiveXObject("Microsoft.XMLHTTP");
 						if (addgrpRequest) {
 								addgrpRequest.onreadystatechange = grpAdded;
-								addgrpRequest.open("GET", url, true);
-								addgrpRequest.send();
+								addgrpRequest.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
+								addgrpRequest.setRequestHeader("Content-length", params.length);
+								addgrpRequest.setRequestHeader("Connection", "close");
+								addgrpRequest.open("POST", url, true);
+								addgrpRequest.send(params);
 						}
 				}
 			}