gistfile1.txt

$(function(){

  var intervals = [];
  $("#scroller-inner").children('div').each(function(k, v){
    intervals.push(parseInt($(this).attr('id').split('-')[1]));
  })

  setInterval(function(){
    if(typeof(player.isSessionReady) == 'undefined') return;
    if(!player.isSessionReady()) return;
    var offset = Math.round(player.getOffset());

    var filtered = [];

    $.each(intervals, function(i, v){
      if(v <= offset){
        filtered.push(v)
      }
    });
    
    $('.thumb-seek').removeClass('thumb-current');
    $('#seek-' + filtered.reverse()[0]).addClass('thumb-current');

  }, 1000);

});