track.js in webshims-rails-0.4.7

- old
+ new

@@ -1,9 +1,10 @@
 jQuery.webshims.register('track', function($, webshims, window, document, undefined){
 	"use strict";
 	var mediaelement = webshims.mediaelement;
 	var id = new Date().getTime();
+	var ADDBACK = $.fn.addBack ? 'addBack' : 'andSelf';
 	//descriptions are not really shown, but they are inserted into the dom
 	var showTracks = {subtitles: 1, captions: 1, descriptions: 1};
 	var notImplemented = function(){
 		webshims.error('not implemented yet');
 	};
@@ -387,10 +388,10 @@
 						});
 					});
 				}
 				
 				trackData = webshims.data(track, 'trackData', {track: obj});
-				mediaelement.loadTextTrack(mediaelem, track, trackData, ($.prop(track, 'default') && $(track).siblings('track[default]').andSelf()[0] == track));
+				mediaelement.loadTextTrack(mediaelem, track, trackData, ($.prop(track, 'default') && $(track).siblings('track[default]')[ADDBACK]()[0] == track));
 			} else {
 				if(supportTrackMod){
 					copyProps.forEach(function(copyProp){
 						webshims.defineProperty(obj, copyName[copyProp] || copyProp, {
 							value: track[copyProp],
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