Method to get 'slideshowID'

I'm trying to synchronize start of the views slideshow with the start of an HTML5 audio object. In order to acomplish this, I created a link with ".playback" css class like this:

<a class="playback" href="#"> PLAY </a>
<audio controls="" loop="" id="musicPlayer" tabindex="0">
<source type="audio/mp3" src="http://www.mysite.com/sites/default/files/file.mp3"></source>
<source type="audio/ogg" src="http://www.mysite.com/sites/default/files/file.ogg"></source>
</audio>

I created a js file to synchro the two events that contains this code:

(function($) {
    Drupal.behaviors.myBehavior = {
        attach: function (context, settings) {
            $(".playback").click(function(e) {
                e.preventDefault();
                var uniqueID = 'slideshow_privat-block';
                // This next line will get the audio element
                // that is adjacent to the link that was clicked.
                var song = $(this).next('audio').get(0);
                if (song.paused) {
                    song.play();
                    Drupal.viewsSlideshowCycle.play({ "action": 'play', "slideshowID": uniqueID });
                }
                else {
                    song.pause();
                    Drupal.viewsSlideshowCycle.pause({ "action": 'pause', "slideshowID": uniqueID });
                }
            });

        }
    };
})(jQuery);

I had to manually define "var uniqueID" because I can't find a method or something to get the "var uniqueID" dinamically. Is there some method to acomplish this??

Thanks in advance!