+// if url == http://localhost/photos/index/toto/titi, path_info == /toto/titi
+// if url == http://localhost/photos/index, path_info is not set
+// if url == http://localhost/photos/, path_info is not set
+// if path_info is not set, we are at top level, so we redirect to /photos/index/
+if (! isset($_SERVER["PATH_INFO"])) {
+ header("Location: $scriptUrlPath/");
+ exit();
+}
+
+$shortPath = $_SERVER["PATH_INFO"];
+if ($shortPath == '/') $shortPath = '';
+