--- modules/system/system-behavior.css	2010-05-03 13:10:38.665994070 +0200
+++ modules/system/system-behavior-new.css	2010-05-03 13:12:38.866420870 +0200
@@ -299,7 +299,10 @@ html.js .js-hide {
  * causes issues for keyboard only or voice recognition users.
  */
 .element-invisible {
-  height: 0;
+  width: 1px;
+  height: 1px;
+  opacity: 0;
+  filter: alpha(opacity=0); /* IE's opacity */
   overflow: hidden;
   position: absolute;
 }