Index: wp-admin/custom-background.php
===================================================================
--- wp-admin/custom-background.php	(revision 20957)
+++ wp-admin/custom-background.php	(working copy)
@@ -234,7 +234,8 @@
 </tr>
 <?php endif; ?>
 
-<?php if ( get_theme_support( 'custom-background', 'default-image' ) ) : ?>
+<?php $default_image = get_theme_support( 'custom-background', 'default-image' ); ?> 
+<?php if ( $default_image && get_background_image() != $default_image ) : ?>
 <tr valign="top">
 <th scope="row"><?php _e('Restore Original Image'); ?></th>
 <td>
Index: wp-admin/custom-header.php
===================================================================
--- wp-admin/custom-header.php	(revision 20957)
+++ wp-admin/custom-header.php	(working copy)
@@ -637,7 +637,8 @@
 </tr>
 	<?php endif;
 
-	if ( current_theme_supports( 'custom-header', 'default-image' ) ) : ?>
+	$default_image = get_theme_support( 'custom-header', 'default-image' );
+	if ( $default_image && get_header_image() != $default_image ) : ?>
 <tr valign="top">
 <th scope="row"><?php _e( 'Reset Image' ); ?></th>
 <td>