assigning source src with javascript help needed

Hi all,

i would like to populate this line:

<source src="audio/mysong1.mp3">

with the javascript var = song

but I am not sure the way to do this...

I tried this instead of the actual line (in the same area) -  but it didn't work:

var t = document.createTextNode("<source src='audio/mysong2.mp3'>"); document.body.appendChild(t);

any suggestions are welcome - thanks

<script> var song = "mysong2.mp3"; </script> <div id="wrapper"> <audio preload="auto" controls> <source src="audio/mysong1.mp3"> </audio> </div>