$(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'));

      setInterval(ScrollRight,3000);

     $('#right_scroll img').click(ScrollRight);

    $('#left_scroll img').click(ScrollLeft);

                                                      
  //when user clicks the image for sliding right      

        function ScrollRight(){

      

            //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' : '-190px'});

            });

        }

      

        //when user clicks the image for sliding left

        function ScrollLeft(){

          

            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' : '-190px'});

            });

          

           

        }

  });