add new timeline and find input to video player

source/Ox.js

@@ -3864,11 +3864,12 @@ Ox.highlight <f> Highlight matches in a string
     > Ox.highlight('foobar', 'foo', 'match')
     '<span class="match">foo</span>bar'
 @*/
+// fixme: with regexp, special chars would have to be escaped
 Ox.highlight = function(txt, str, classname) {
-    return txt.replace(
+    return str.length ? txt.replace(
         new RegExp('(' + str + ')', 'ig'),
         '<span class="' + classname + '">$1</span>'
-    );
+    ) : txt;
 };
 
 /*@