Index: wp-content/themes/twentyeleven/style.css
===================================================================
--- wp-content/themes/twentyeleven/style.css	(revision 18526)
+++ wp-content/themes/twentyeleven/style.css	(working copy)
@@ -1675,6 +1675,16 @@
 	font-weight: bold;
 	line-height: 2.2em;
 }
+#content nav a:focus,
+#content nav a:active,
+#content nav a:hover {
+	text-decoration: none;
+}
+#content nav a[href]:focus,
+#content nav a[href]:active,
+#content nav a[href]:hover {
+	text-decoration: underline;
+}
 #nav-above {
 	padding: 0 0 1.625em;
 }