Phonegap Media API (Android) - Media is not defined

I want to build a Android WebView app, which plays a sound when the user presses a button.For some reason I can't get the PhoneGap media API to work.

It keep showing:

Uncaught ReferenceError: Media is not defined at
file:///android_asset/www/script.js:3

Here is my code:

$(document).ready(function(){
  var myMedia = new Media("/android_asset/www/one.mp3");

  $('.one').click(function(){ 
    myMedia.play();
  });
});

Anyone know how to fix this problem?