(function ($) {
    $.fn.lazyload = function (options) {
        var settings = { threshold: 0,
            failurelimit: 0,
            event: "scroll",
            effect: "show",
            container: window
        }; if (options) { $.extend(settings, options); }

        var elements = this; if ("scroll" == settings.event) {
            $(settings.container).bind("scroll", function (event) {
                var counter = 0; elements.each(function () {
                    if ($.abovethetop(this, settings) ||
$.leftofbegin(this, settings)) { } else if (!$.belowthefold(this, settings) &&
!$.rightoffold(this, settings)) { $(this).trigger("appear"); } else { if (counter++ > settings.failurelimit) { return false; } } 
                }); var temp = $.grep(elements, function (element) { return !element.loaded; });
                elements = $(temp);
            });
        }
        this.each(function () {
            var self = this; if (undefined == $(self).attr("original")) { $(self).attr("original", $(self).attr("src")); } if ("scroll" != settings.event ||
undefined == $(self).attr("src") ||
"" == $(self).attr("src") ||
settings.placeholder == $(self).attr("src") ||
($.abovethetop(self, settings) ||
$.leftofbegin(self, settings) ||
$.belowthefold(self, settings) ||
$.rightoffold(self, settings))) {
                if (settings.placeholder) { $(self).attr("src", settings.placeholder); } else { $(self).removeAttr("src"); }
                self.loaded = false;
            } else { self.loaded = true; }

            $(self).one("appear", function () {
                if (!this.loaded || 1 == 1) {
                    $("<img />")
.bind("load", function () {
    $(self)
.hide()
.attr("src", $(self).attr("original"))
[settings.effect](settings.effectspeed); self.loaded = true;
})
.attr("src", $(self).attr("original"));
                };
            }); if ("scroll" != settings.event) { $(self).bind(settings.event, function (event) { if (!self.loaded) { $(self).trigger("appear"); } }); } 
        }); $(settings.container).trigger(settings.event);
        return this;
    };


    $.belowthefold = function (element, settings) {
        if (settings.container === undefined || settings.container === window) { var fold = $(window).height() + $(window).scrollTop(); } else { var fold = $(settings.container).offset().top + $(settings.container).height(); }
        return fold <= $(element).offset().top - settings.threshold;
    };
    $.rightoffold = function (element, settings) {
        if (settings.container === undefined || settings.container === window) { var fold = $(window).width() + $(window).scrollLeft(); } else { var fold = $(settings.container).offset().left + $(settings.container).width(); }
        return fold <= $(element).offset().left - settings.threshold;
    };
    $.abovethetop = function (element, settings) {
        if (settings.container === undefined || settings.container === window) { var fold = $(window).scrollTop(); } else { var fold = $(settings.container).offset().top; }
        return fold >= $(element).offset().top + settings.threshold + $(element).height();
    };
    $.leftofbegin = function (element, settings) {
        if (settings.container === undefined || settings.container === window) { var fold = $(window).scrollLeft(); } else { var fold = $(settings.container).offset().left; }
        return fold >= $(element).offset().left + settings.threshold + $(element).width();
    };


    $.extend($.expr[':'], { "below-the-fold": "$.belowthefold(a, {threshold : 0, container: window})",
        "above-the-fold": "!$.belowthefold(a, {threshold : 0, container: window})",
        "right-of-fold": "$.rightoffold(a, {threshold : 0, container: window})",
        "left-of-fold": "!$.rightoffold(a, {threshold : 0, container: window})"
    });
})(jQuery);