Index: wp-admin/css/list-tables.css
===================================================================
--- wp-admin/css/list-tables.css	(revision 33877)
+++ wp-admin/css/list-tables.css	(working copy)
@@ -166,11 +166,12 @@
 	text-align: center;
 }
 
-#replyrow h5 {
+#replyrow legend {
 	margin: .2em 0 0;
 	padding: 0 5px;
 	line-height: 1.4em;
 	font-size: 1em;
+	font-weight: 600;
 }
 
 #edithead .inside,
Index: wp-admin/includes/template.php
===================================================================
--- wp-admin/includes/template.php	(revision 33877)
+++ wp-admin/includes/template.php	(working copy)
@@ -494,8 +494,9 @@
 <?php else : ?>
 <div id="com-reply" style="display:none;"><div id="replyrow" style="display:none;">
 <?php endif; ?>
-	<div id="replyhead" style="display:none;"><h5><?php _e( 'Reply to Comment' ); ?></h5></div>
-	<div id="addhead" style="display:none;"><h5><?php _e('Add new Comment'); ?></h5></div>
+	<fieldset>
+	<legend id="replyhead" style="display:none;"><?php _e( 'Reply to Comment' ); ?></legend>
+	<legend id="addhead" style="display:none;"><?php _e('Add new Comment'); ?></legend>
 	<div id="edithead" style="display:none;">
 		<div class="inside">
 		<label for="author"><?php _e('Name') ?></label>
@@ -520,7 +521,7 @@
 	wp_editor( '', 'replycontent', array( 'media_buttons' => false, 'tinymce' => false, 'quicktags' => $quicktags_settings ) );
 	?>
 	</div>
-
+	</fieldset>
 	<p id="replysubmit" class="submit">
 	<a href="#comments-form" class="save button-primary alignright">
 	<span id="addbtn" style="display:none;"><?php _e('Add Comment'); ?></span>