$(function(){
          //Get our elements for faster access and set overlay width
          var div = $('div.sc_menu'),
          ul = $('ul.sc_menu'),
          // unordered list's left margin
          ulPadding = 15;

          //Get menu width
          var divWidth = div.width();

          //Remove scrollbars
          div.css({overflow: 'hidden'});

          //Find last image container
          var lastLi = ul.find('li:last-child');

          //When user move mouse over menu
          div.mousemove(function(e){

          //As images are loaded ul width increases,
          //so we recalculate it each time
          var ulWidth = lastLi[0].offsetLeft + lastLi.outerWidth() + ulPadding;

          var left = (e.pageX - div.offset().left) * (ulWidth-divWidth) / divWidth;
          div.scrollLeft(left);
          });
          });