$(document).ready(function() {
    //move he last list item before the first item. The purpose of this is if the user clicks to slide left he will be able to see the last item.
    //$('#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
            
        },300,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' : '-152px'
                
            });
            
        });
    });

    //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
        },300,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' : '-152px'
            });
        });


    });

});