$(document).ready(function(){
  $('a[@href$=.mp3]').addClass('audio_player');
  $('a[@href$=.mp3]').media(
    { type:'mp3',
      width: 250, height: 19, autoplay: false,
      flashvars: { backcolor: '0xFFFFFF', showdownload: 'false', height: '19', width: '250' }
    });
});