Help With PHP Code Snip for PHPBB Board?

Hi All -

I am trying to have a .mp3 file play when the below code runs.... is there any possible way to do that? (if not mp3 wav will work too) - I just am not sure how to do it? Can anyone edit this do play a file such as that?

HERE IS THE CURRENT CODE:

<!-- BEGIN switch_enable_pm_popup -->
<script language="Javascript" type="text/javascript">
<!--
if ( {PRIVATE_MESSAGE_NEW_FLAG} )
{
pmWindow = window.open('{U_PRIVATEMSGS_POPUP}', '_phpbbprivmsg', 'HEIGHT=225,resizable=yes,WIDTH=400');
if (!window.pmWindow) {
new_pm_prompt = confirm('{L_PRIVATEMSG_NEW}');
if(new_pm_prompt == true) {
// Redirect to Inbox if OK is clicked
window.location = '{U_PRIVATEMSGS}';
}
else {
// Close prompt if cancel is clicked
}
}
}
//-->
</script>
<!-- END switch_enable_pm_popup -->