--- upload_image.module
+++ upload_image.module
@@ -92,7 +92,7 @@
           $node->body .= theme('table', $header, $rows, array('id' => 'upload-image-attachments'));
         }
         if (count($thumbnails)) {
-          $node->body .= theme('upload_images', $thumbnails);
+          $node->body = theme('upload_images_body', $node->body, $thumbnails);
         }
       }
       break;
@@ -187,4 +187,8 @@
   $output .= theme('item_list', $list);
   $output .= '</div>';
   return $output;
+}
+
+function theme_upload_images_body($body, $thumbnails) {
+  return $body . theme('upload_images', $thumbnails);
 }