diff --git a/htdocs/theme/common/window/alert.css b/htdocs/theme/common/window/alert.css
index 59bcd338d12..353e862f88d 100644
--- a/htdocs/theme/common/window/alert.css
+++ b/htdocs/theme/common/window/alert.css
@@ -1,6 +1,6 @@
 .overlay_alert {
 	background-color: #ACBCBB;
-/*	filter:alpha(opacity=60);	*/
+  filter:alpha(opacity=60);
 	-moz-opacity: 0.6;
 	opacity: 0.6;
 }
diff --git a/htdocs/theme/common/window/default.css b/htdocs/theme/common/window/default.css
index 3c4c46ae838..7b129b60142 100644
--- a/htdocs/theme/common/window/default.css
+++ b/htdocs/theme/common/window/default.css
@@ -1,13 +1,13 @@
 .overlay_dialog {
 	background-color: #666666;
-/*	filter:alpha(opacity=60);	*/
+  filter:alpha(opacity=60);
 	-moz-opacity: 0.6;
 	opacity: 0.6;
 }
 
 .overlay___invisible__ {
   background-color: #666666;
-/*	filter:alpha(opacity=0);	*/
+  filter:alpha(opacity=0);
 	-moz-opacity: 0;
 	opacity: 0;
 }