diff --git a/js/server_status_monitor.js b/js/server_status_monitor.js
index e1bcad371e..4d017a36cc 100644
--- a/js/server_status_monitor.js
+++ b/js/server_status_monitor.js
@@ -1238,7 +1238,7 @@ AJAX.registerOnload('server_status_monitor.js', function () {
             if ($('#selection_box').length) {
                 $('#selection_box').remove();
             }
-            selectionBox = $('<div id="selection_box" style="z-index:1000;height:250px;position:absolute;background-color:#87CEEB;opacity:0.4;filter:alpha(opacity=40);pointer-events:none;">');
+            var selectionBox = $('<div id="selection_box" style="z-index:1000;height:250px;position:absolute;background-color:#87CEEB;opacity:0.4;filter:alpha(opacity=40);pointer-events:none;">');
             $(document.body).append(selectionBox);
             selectionStartX = ev.pageX;
             selectionStartY = ev.pageY;
@@ -1289,7 +1289,7 @@ AJAX.registerOnload('server_status_monitor.js', function () {
 
         $(document.body).mouseup(function () {
             if ($('#selection_box').length) {
-                selectionBox.remove();
+                $('#selection_box').remove();
             }
         });