Index: misc/tableheader.js
===================================================================
RCS file: /cvs/drupal/drupal/misc/tableheader.js,v
retrieving revision 1.16
diff -u -p -r1.16 tableheader.js
--- misc/tableheader.js	30 Jan 2008 10:17:39 -0000	1.16
+++ misc/tableheader.js	1 Feb 2008 20:32:10 -0000
@@ -60,8 +60,8 @@ Drupal.behaviors.tableHeader = function 
     // Track horizontal positioning relative to the viewport and set visibility.
     var hScroll = document.documentElement.scrollLeft || document.body.scrollLeft;
     var vOffset = (document.documentElement.scrollTop || document.body.scrollTop) - e.vPosition;
-    var visState = (vOffset > 0 && vOffset < e.vLength) ? 'visible' : 'hidden';
-    $(e).css({left: -hScroll + e.hPosition +'px', visibility: visState});
+    var visState = (vOffset > 0 && vOffset < e.vLength) ? 'block' : 'none';
+    $(e).css({left: -hScroll + e.hPosition +'px', display: visState});
   }
 
   // Only attach to scrollbars once, even if Drupal.attachBehaviors is called