Index: themes/bartik/css/style.css
===================================================================
RCS file: /cvs/drupal/drupal/themes/bartik/css/style.css,v
retrieving revision 1.41
diff -u -r1.41 style.css
--- themes/bartik/css/style.css	2 Dec 2010 23:54:56 -0000	1.41
+++ themes/bartik/css/style.css	3 Dec 2010 07:02:29 -0000
@@ -155,6 +155,9 @@
   border-color: #555;
   border-color: rgba(255,255,255,0.18);  
 }
+tr.merge-down td {
+  border: none;
+}
 tr.odd {
   background: #e4e4e4;
   background: rgba(0, 0, 0, 0.105)