diff --git a/mozilla/calendar/resources/skin/classic/btn1.gif b/mozilla/calendar/resources/skin/classic/btn1.gif
new file mode 100644
index 00000000000..e5605c1b6c7
Binary files /dev/null and b/mozilla/calendar/resources/skin/classic/btn1.gif differ
diff --git a/mozilla/calendar/resources/skin/classic/calendar.css b/mozilla/calendar/resources/skin/classic/calendar.css
index fb13dde0741..929e6810cf7 100644
--- a/mozilla/calendar/resources/skin/classic/calendar.css
+++ b/mozilla/calendar/resources/skin/classic/calendar.css
@@ -65,7 +65,7 @@
  *-------------------------------------------------------------------*/
 
 .toolbarbutton-1 {
-  list-style-image: url("chrome://calendar/skin/btn1.png");
+  list-style-image: url("chrome://calendar/skin/btn1.gif");
 }
 
 
diff --git a/mozilla/calendar/resources/skin/modern/btn1.gif b/mozilla/calendar/resources/skin/modern/btn1.gif
new file mode 100644
index 00000000000..e5605c1b6c7
Binary files /dev/null and b/mozilla/calendar/resources/skin/modern/btn1.gif differ
diff --git a/mozilla/calendar/resources/skin/modern/calendar.css b/mozilla/calendar/resources/skin/modern/calendar.css
index 43d8db40056..81fbf3cbe86 100644
--- a/mozilla/calendar/resources/skin/modern/calendar.css
+++ b/mozilla/calendar/resources/skin/modern/calendar.css
@@ -66,7 +66,7 @@
  *-------------------------------------------------------------------*/
 
 .toolbarbutton-1 {
-  list-style-image: url("chrome://calendar/skin/btn1.png");
+  list-style-image: url("chrome://calendar/skin/btn1.gif");
 }