1<!DOCTYPE html>
2<html>
3  <body>
4  <script>
5    function addAudio(id, file) {
6      var audio = document.createElement('audio');
7      audio.src = file;
8      audio.loop = true;
9      audio.id = id;
10      document.body.appendChild(audio);
11    }
12
13    function getIDFromURL() {
14      var query = window.location.search;
15      return query.substring(query.lastIndexOf("id=") + 3);
16    }
17
18    addAudio('background_audio', 'pink_noise_20s.wav');
19    // Main audio file is identified by an ID passed in the page-set.
20    addAudio(getIDFromURL(), 'pink_noise_140ms.wav');
21  </script>
22  </body>
23</html>