$(document).ready(function () {
   //find div
    var div = $('div.showcase');
    //find ul width
    var liNum = $(div).find('ul').children('li').length;
    var speed = 1000;
    var containerWidth = 560;
    var itemWidth = 140;
    //Remove scrollbars
    $(div).css({overflow: 'hidden'});
    $('div.right-arrow').click(function(e){     
          if(($(div).scrollLeft()+containerWidth)<(liNum*itemWidth)){
             $(div).animate({
                scrollLeft: '+='+containerWidth
              }, speed);
          }
    }); 
    $('div.left-arrow').click(function(e){      
        if(($(div).scrollLeft()+containerWidth)>containerWidth){
                $(div).animate({
                scrollLeft: '-='+containerWidth
              }, speed);
        }
    });
});