Index: branches/unlabeled/unlabeled-1.2.2/core/admin_templates/js/script.js
===================================================================
diff -u -r6904 -r6905
--- branches/unlabeled/unlabeled-1.2.2/core/admin_templates/js/script.js	(.../script.js)	(revision 6904)
+++ branches/unlabeled/unlabeled-1.2.2/core/admin_templates/js/script.js	(.../script.js)	(revision 6905)
@@ -448,12 +448,21 @@
 function open_popup($prefix_special, $event, $t, $window_size) {
 	if (!$window_size) {
 		// if no size given, then query it from ajax	
+		var $default_size = '750x400';
 		var $pm = getFrame('head').$popup_manager;
-		$pm.ResponceFunction = function ($responce) {
-			open_popup($prefix_special, $event, $t, $responce);
+		if ($pm) {
+			// popup manager was found in head frame	
+			$pm.ResponceFunction = function ($responce) {
+				if (!$responce.match(/([\d]+)x([\d]+)/)) {
+					// invalid responce was received, may be php fatal error during AJAX request
+					$responce = $default_size;
+				}	
+				open_popup($prefix_special, $event, $t, $responce);
+			}
+			$pm.GetSize($t);
+			return ;
 		}
-		$pm.GetSize($t);	
-		return ;
+		$window_size = $default_size;
 	}
 
 	var $kf = document.getElementById($form_name);