$(document).ready(function() {
    if ($('#carousel_ul li').length > 1) {

        $('#carousel_ul li').clone().appendTo($('#carousel_ul'));

        var items = $('#carousel_ul li').length
        var offset = (items / 2) * 974;

        //$('#main').prepend(items);
        $('#carousel_ul').css('left', -offset);

    }
    else if ($('#carousel_ul li').length == 1) {

        $('#carousel_ul').css('left', '0');
        $('.carousel_nav').hide();
    }

    //when user clicks the image for sliding right
    $('#right_scroll').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;

        //calculate the new left indent of the unordered list
        var left_indent = parseInt($('#carousel_ul').css('left')) - 974;

        //make the sliding effect using jquery's anumate function '
        $('#carousel_ul:not(:animated)').animate({ 'left': left_indent }, 800, 'easeOutExpo', 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
            $('#carousel_ul').css({
                'left': left_indent + 974
            });
        });
    });

    //when user clicks the image for sliding left
    $('#left_scroll').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')) + 974;

        $('#carousel_ul:not(:animated)').animate({ 'left': left_indent }, 800, 'easeOutExpo', 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
            $('#carousel_ul').css({
                'left': left_indent - 974
            });

        });


    });
    window.setInterval(scroll_, 5000);
    function scroll_() {
        if ($('#carousel_ul li').length > 1) {
            $("#right_scroll").click();
        }
    }
});