$(document).ready(function() {
      //move he last list item before the first item. The purpose of this is if the user clicks to slide left he will be able to see the last item.
      $('#carousel_ul li:first').before($('#carousel_ul li:last'));

      //when user clicks the image for sliding right
      $('#right_scroll img').click(function(){

          //get the width of the items ( i like making the jquery part dynamic, so if you change the width in the css you won't have o change it here too ) '
          var item_width = $('#carousel_ul li').outerWidth() + 10;

          //calculae the new left indent of the unordered list
          var left_indent = parseInt($('#carousel_ul').css('left')) - item_width;

          //make the sliding effect using jquery's anumate function '
          $('#carousel_ul:not(:animated)').animate({'left' : left_indent},500,function(){

              //get the first list item and put it after the last list item (that's how the infinite effects is made) '
              $('#carousel_ul li:last').after($('#carousel_ul li:first'));

              //and get the left indent to the default -210px
              $('#carousel_ul').css({'left' : '-510px'});
          });
      });

      //when user clicks the image for sliding left
      $('#left_scroll img').click(function(){

          var item_width = $('#carousel_ul li').outerWidth() + 10;

          /* same as for sliding right except that it's current left indent + the item width (for the sliding right it's - item_width) */
          var left_indent = parseInt($('#carousel_ul').css('left')) + item_width;

          $('#carousel_ul:not(:animated)').animate({'left' : left_indent},500,function(){

          /* when sliding to left we are moving the last item before the first list item */
          $('#carousel_ul li:first').before($('#carousel_ul li:last'));

          /* and again, when we make that change we are setting the left indent of our unordered list to the default -210px */
          $('#carousel_ul').css({'left' : '-510px'});
          });


      });
});