(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) {
            $(settings.container).bind("scroll",
			function (event) {
			    var counter = 0;
			    elements.each(function () {
			        if (!$.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)
			})
        }
        return this.each(function () {
            var self = this;

            $(self).attr("_src", $(self).attr("_src"));
            if ("scroll" != settings.event || $.belowthefold(self, settings) || $.rightoffold(self, settings)) {
                if (settings.placeholder) {
                    //  $(self).attr("src", settings.placeholder)
                } else {
                    //                  //  $(self).removeAttr("src")
                }
                // self.loaded = false
            } else {
               // alert("s");
                $(self).attr("src", $(self).attr("_src"));
                self.loaded = true
            }
            $(self).one("appear",
			function () {
			    if (!this.loaded) {
			        $("<img />").bind("load",
					function () {
					    $(self).hide().attr("src", $(self).attr("_src"))[settings.effect](settings.effectspeed);
					    self.loaded = true
					}).attr("src", $(self).attr("_src"))
			    }
			});
            if ("scroll" != settings.event) {
                $(self).bind(settings.event,
				function (event) {
				    if (!self.loaded) {
				        $(self).trigger("appear")
				    }
				})
            }
        })
    };
    $.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
    };
    $.extend($.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);