video source switch

var mainVideo = $('video');

$(document).on('click', '.js-video-trigger', function(event)
{

	// find new video file name from link id
	var video = $(this).attr('id');

	mainVideo
		.find('source').each(function()
		{
			var format = $(this).attr('src').split('.').pop(); // find this file extension
			$(this).attr('src', 'assets/videos/' + video + '.' + format); // change source
		});

	// reload video
	mainVideo[0].load();

	event.preventDefault();

});