How to give audio play file path in javascript for push notification?

I have written following code in javascript to play audio file on receving push notification :

var my_media = new Media("http://ift.tt/1HiGO8W"); my_media.play();

Tried this also:

var my_media = new Media("/android_asset/www/soundw.mp3"); my_media.play();

and tried this also:

var my_media = new Media("soundw.mp3"); my_media.play();

but nothing is working .Please tell me what exact path should I give?How can I play audio files using javascript?