Index: modules/overlay/overlay-parent.js
===================================================================
RCS file: /cvs/drupal/drupal/modules/overlay/overlay-parent.js,v
retrieving revision 1.10
diff -u -p -r1.10 overlay-parent.js
--- modules/overlay/overlay-parent.js	24 Dec 2009 13:32:46 -0000	1.10
+++ modules/overlay/overlay-parent.js	24 Dec 2009 19:17:26 -0000
@@ -319,13 +319,13 @@ Drupal.overlay.load = function (url) {
   // switching between pages with the overlay already open, due to
   // performance issues (see http://drupal.org/node/615130).
   self.$iframe
-    .css('opacity', 0.2)
+    .css('visibility', 'hidden')
     .load(function () {
       self.isLoading = false;
 
       // Only continue when overlay is still open and not closing.
       if (self.isOpen && !self.isClosing) {
-        self.$iframe.css('opacity', 1);
+        self.$iframe.css('visibility', '');
         self.$dialog.addClass('overlay-loaded');
       }
       else {