Javascript : Get the HTMLAudioElement currently playing

How can I access an HTMLAudioElement that is currently playing, without knowing anything about it? It is not an <audio> tag in the page, it is a

audio_element = document.createElement('audio');

But now (at the time when I want the audio to pause) the DOM has been modified by a

$('#details').html().load(ajax_loader, "id=" + id, function() {
    <!-- another playlist -->
}

And I can't seem to retrieve my audio element back. It's no longer in the DOM, but the audio is still playing witch is fine BTW, but now I want to play something else. And when I do, I can hear both audio files.

So really my question is just that : How can I access an HTMLAudioElement that is currently playing, without knowing anything about it?