$(document).ready(function() {
    $(document).pngFix();

    $("#wrapper").scrollLeft(0);
    $("#btnGoLeft").hide();
    $("#btnGoRight").show();

    $("#btnGoRight").click(function() {
        var scrollLeft = $("#wrapper").scrollLeft() + 800;
        $("#wrapper").animate(
            {
                scrollLeft: scrollLeft
            },
            {
                duration: "normal",
                easing: "linear",
                complete: function() {
                    if (scrollLeft >= 2400) {
                        $("#btnGoRight").hide();
                    }
                    if (scrollLeft > 0) {
                        $("#btnGoLeft").show();
                    }
                }
            }
        );
        return false;
    });
    $("#btnGoLeft").click(function() {
        var scrollLeft = $("#wrapper").scrollLeft() - 800;
        $("#wrapper").animate(
            {
                scrollLeft: scrollLeft
            },
            {
                duration: "normal",
                easing: "linear",
                complete: function() {
                    if (scrollLeft < 2400) {
                        $("#btnGoRight").show();
                    }
                    if (scrollLeft <= 0) {
                        $("#btnGoLeft").hide();
                    }
                }
            }
        );
        return false;
    });
  });