Index: schedule/Module/calendar.php
===================================================================
--- schedule/Module/calendar.php	(revision 16554)
+++ schedule/Module/calendar.php	(revision 16555)
@@ -173,4 +173,7 @@
                     testXML = new XMLHttpRequest();
                     testXML.open("GET",url,true);
+                    testXML.setRequestHeader("Cache-Control", "no-cache");
+                    testXML.setRequestHeader("If-Match", "*");
+        
                     testXML.onload=function() {
                         alert (" status: " + testXML.readyState + " " + testXML.status);
@@ -185,5 +188,5 @@
                     };
 					
-                    testXML.send();
+                    testXML.send(null);
                 }
                  CAL.addEventListener("onSelect", function(){