added missing files

html/functions.php

@@ -0,0 +1,13 @@
+<?php
+
+function error($txt) {
+  echo json_encode(array('success' => false, 'txt' => $txt));
+  exit;
+}
+
+function success($txt) {
+  echo json_encode(array('success' => true, 'txt' => $txt));
+  exit;
+}
+
+?>