diff --git a/notifications/js/notificationajaxpopup.js b/notifications/js/notificationajaxpopup.js
index c088cb681f..1b4b272331 100644
--- a/notifications/js/notificationajaxpopup.js
+++ b/notifications/js/notificationajaxpopup.js
@@ -9,7 +9,7 @@
  */
 
 var notifymessages = new Array();
- 
+
 function notificationwindow_init() {
 	window.setTimeout("notificationwindow_refresh();", 1000);
 }
@@ -25,14 +25,17 @@ function notificationwindow_refresh() {
 function notificationwindow_display() {
 	var notificationwindow;
 	var notificationwindow_message;
+	var Browserwidth;
+	var Browserheight;
 	notificationwindow = document.getElementById("notificationwindow");
 	notificationwindow_message = document.getElementById("notificationwindow_message");
-	notificationwindow_ok_button = document.getElementById("notificationwindow_ok_button");
 	notificationwindow.style.display = "inline";
 	notificationwindow.style.position = "absolute";
 	notificationwindow.style.width = "500px";
-	notificationwindow.style.left = screen.availWidth/2 - 250 + "px";
-	notificationwindow.style.top = screen.availHeight/4 + "px";
+	Browserwidth = (window.innerWidth || document.body.clientWidth || 640)
+	Browserheight = (window.innerHeight || document.body.clientHeight || 480)
+	notificationwindow.style.left = (Browserwidth/2 - 250) + "px";
+	notificationwindow.style.top = (Browserheight/4) + "px";
 	notificationwindow.style.height = "100%";
 	notificationwindow_message.innerHTML = notifymessages[0];
 	if(notifymessages.length-1 > 0 ) {
@@ -40,6 +43,7 @@ function notificationwindow_display() {
 	} else {
 		notificationwindow_ok_button.value = "OK";
 	}
+
 }
 
 function notificationbell_switch(mode) {