(function($) {

    $.fn.inxyCounter = function(options) {
        var settings = {
            container : window,
            threshold : 100,
            failurelimit : 0,
            event        : "scroll",
            A : "jcjx",
            B : "xxeL",
            C : "xzcr"
        };
                
        if(options) {
            $.extend(settings, options);
        }

        var elements = this;
        
        /* Scroll changes B => C */
        $(settings.container).bind("scroll", function(event) {
            
            var counter = 0;
            elements.each(function() {
                if ($.abovethetop(this, settings) ||
                    $.leftofbegin(this, settings)) {
                        /* Nothing. */
                } else if (!$.belowthefold(this, settings) &&
                    !$.rightoffold(this, settings)) {
                        $(this).trigger("normalize");
                } else {
                    if (counter++ > settings.failurelimit) {
                        return false;
                    }
                }
            });

            var temp = $.grep(elements, function(element) {
                return !element.normalized;
            });
            elements = $(temp);
        });
        
        /* A => B */
        this.each(function() {
            var self = this;
            $(self).attr('href', $(self).attr('href').replace(settings.A, settings.B));

            if ("scroll" != settings.event  || 
                    ($.abovethetop(self, settings) ||
                     $.leftofbegin(self, settings) || 
                     $.belowthefold(self, settings) || 
                     $.rightoffold(self, settings) )) {
                self.normalized = false;
            } else {
				$(self).attr("href", $(self).attr("href").replace(settings.B, settings.C));
                self.normalized = true;
            }
            
            $(self).one("normalize", function() {
                if (!this.normalized) {
                    $(self).attr("href", $(self).attr("href").replace(settings.B, settings.C));
                };
            });

            if ("scroll" != settings.event) {
                $(self).bind(settings.event, function(event) {
                    if (!self.normalized) {
                        $(self).trigger("normalize");
                    }
                });
            }
        });
        
        $(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();
    };

    
})(jQuery);