diff --git a/apps/common/main/lib/component/Window.js b/apps/common/main/lib/component/Window.js
index ed374b246..1c452056b 100644
--- a/apps/common/main/lib/component/Window.js
+++ b/apps/common/main/lib/component/Window.js
@@ -693,13 +693,12 @@ define([
                         mask.attr('counter', parseInt(mask.attr('counter'))+1);
                         mask.show();
                     } else {
-                        var opacity = mask.css('opacity');
                         mask.css('opacity', 0);
                         mask.attr('counter', parseInt(mask.attr('counter'))+1);
                         mask.show();
 
                         setTimeout(function () {
-                            mask.css(_getTransformation(opacity));
+                            mask.css(_getTransformation('0.2'));
                         }, 1);
                     }
 
@@ -785,12 +784,11 @@ define([
 
                     if ( hide_mask ) {
                         if (this.options.animate !== false) {
-                            var opacity = mask.css('opacity');
                             mask.css(_getTransformation(0));
 
                             setTimeout(function () {
-                                mask.css('opacity', opacity);
                                 if (parseInt(mask.attr('counter'))<1) {
+                                    mask.css('opacity', '0.2');
                                     mask.hide();
                                     mask.attr('counter', 0);
                                 }
@@ -826,12 +824,11 @@ define([
 
                         if ( hide_mask ) {
                             if (this.options.animate !== false) {
-                                var opacity = mask.css('opacity');
                                 mask.css(_getTransformation(0));
 
                                 setTimeout(function () {
-                                    mask.css('opacity', opacity);
                                     if (parseInt(mask.attr('counter'))<1) {
+                                        mask.css('opacity', '0.2');
                                         mask.hide();
                                         mask.attr('counter', 0);
                                     }