jQuery.easing.easeOutQuart = function (x, t, b, c, d) {
	return -c * ((t=t/d-1)*t*t*t - 1) + b;
};

jQuery(function( $ ){


  $('#speakers_wrap').serialScroll({
    items:'div.speaker',
    prev:'span.prev',
    next:'span.next',
    axis: 'x',
    step: 1,
    offset: -658,
    start:4, //as we are centering it, start at the 2nd
    duration:800,
    force:true,
    stop:true,
    lock:false,
    cycle:false, //don't pull back once you reach the end
    easing:'easeOutQuart', //use this easing equation for a funny effect
    jump: false //click on the images to scroll to them
  });


});