Auto-stop pieces when starting another piece. Code inside.

[diovudau]

<!-- Let only one file play at the same time. If a user has no java script they have to stop it themselves -->
<script>
window.addEventListener("play", function(evt)
{
    if(window.$_currentlyPlaying && window.$_currentlyPlaying != evt.target)
    {
        window.$_currentlyPlaying.pause();
    }
    window.$_currentlyPlaying = evt.target;
}, true);
</script>