Index: branches/RC/core/admin_templates/js/ajax.js
===================================================================
diff -u -N -r9021 -r9603
--- branches/RC/core/admin_templates/js/ajax.js	(.../ajax.js)	(revision 9021)
+++ branches/RC/core/admin_templates/js/ajax.js	(.../ajax.js)	(revision 9603)
@@ -77,6 +77,9 @@
 
 Request.sendHeaders = function($request) {
 	for (var $header_name in Request.headers) {
+		if (typeof Request.headers[$header_name] == 'function') {
+			continue;
+		}
 		$request.setRequestHeader($header_name, Request.headers[$header_name]);
 	}
 	Request.headers = new Array(); // reset header afterwards