$(document).ready(function(){
  var maxScroll = $("#content-scroll").attr("scrollWidth") -  ($("#content-scroll").width() - 600);
  $("#content-slider").slider({
    animate: true,
    change: handleSliderChange,
    slide: handleSliderSlide,
  });
});

function handleSliderChange(e, ui){
  var maxScroll = $("#content-scroll").attr("scrollWidth") - ($("#content-scroll").width() - 600);
  $("#content-scroll").animate({scrollLeft: ui.value * (maxScroll / 100) }, 1000);
}

function handleSliderSlide(e, ui){
  var maxScroll = $("#content-scroll").attr("scrollWidth") -  ($("#content-scroll").width() - 600);
  $("#content-scroll").attr({scrollLeft: ui.value * (maxScroll / 100) });
}