if (Drupal.jsEnabled) {
  $(document).ready(function() {
    $.fn.media.defaults.flvPlayer = '/drupal/mediaplayer-flash/player.swf';
    $.fn.media.defaults.mp3Player = '/drupal/mp3player/mp3player/audio-player.js';
    $('.filefield-item a').media( { width: 500, height: 300 } );
  });  
}