(function($) {

    $(document).ready(function() {

        var timelineImages = [
            "heritageTimeline-1950.jpg",
            "heritageTimeline-1960.jpg",
            "heritageTimeline-1970.jpg",
            "heritageTimeline-1980.jpg",
            "heritageTimeline-1990.jpg",
            "heritageTimeline-2000.jpg"
        ];
        $("#aboutUs-heritageTimeline .prev").click(function() {
            var img = $("#aboutUs-heritageTimeline img.timelineImg").get(0);
            doNav(img, "prev");
        });

        $("#aboutUs-heritageTimeline .next").click(function() {
            var img = $("#aboutUs-heritageTimeline img.timelineImg").get(0);
            doNav(img, "next");
        });

        function doNav(currentImg, prevNext) {
            var img = currentImg;
            var src = img.src;
            for (var i = 0; i < timelineImages.length; i++) {
                var tlImg = timelineImages[i];
                var index = 0;
                var dir = "";
                if (src.indexOf(tlImg) != -1) {
                    dir = src.substring(0, src.indexOf(tlImg));
                    if (prevNext == "prev") {
                        index = i - 1;
                    } else {
                        index = i + 1;
                    }
                    index = (index + timelineImages.length) % timelineImages.length;
                    img.src = dir + timelineImages[index];

                    var indicatorOffset = $("#aboutUs-heritageTimeline .yearIndicator").width() * index;
                    $("#aboutUs-heritageTimeline .yearIndicator").css({
                        left : indicatorOffset + "px"
                    });

                    break;
                }
            }
        }

    });

})(jQuery);