(function ($) {
    $.fn.stoc = function (options) {
        //Our default options
        var defaults = {
            depth: 6, //how many hN should we search
            start: 1, //which hN will be the first (and after it we go just deeper)
            stocTitle: "<h2>Contents</h2>", //what to display before our box
            listType: "ul", //could be ul or ol
            smoothScroll: 1
        };

        //let's extend our plugin with default or user options when defined
        var options = $.extend(defaults, options);

        return function () {
            //"cache" our target and search objects
            obj = $(this); //target
            //let's declare some variables. We need this var declaration to create them as local variables (not global)
            var appHTML = "", tagNumber = 0, txt = "", id = "", before = "", after = "", previous = options.start, start = options.start, depth = options.depth, i = 0, srcTags = "h" + options.start, cacheHN = "";

            obj.nextUntil('h1').each(function () {
                if ($(this).tagName == "h2" || $(this).tagName == "h3") {
                    //we will cache our current H element
                    cacheHN = $(this);
                    //if we are on h1, 2, 3...
                    tagNumber = ( cacheHN.get(0).tagName ).substr(1);

                    //sets the needed id to the element
                    id = cacheHN.attr('id');
                    if (id == "") { //if it doesn't have only, of course
                        id = "h" + tagNumber + "_" + i;
                        cacheHN.attr('id', id);
                    }
                    //our current text
                    txt = cacheHN.text();

                    switch (true) { //with switch(true) we can do comparisons in each case
                        case (tagNumber > previous) : //it means that we went down one level (e.g. from h2 to h3)
                            appHTML = appHTML + "<" + options.listType + "><li>" + before + "<a href=\"#" + id + "\">" + txt + "</a>";
                            previous = tagNumber;
                            break;
                        case (tagNumber == previous) : //it means that stay on the same level (e.g. h3 and stay on it)
                            appHTML = appHTML + "</li><li>" + before + "<a href=\"#" + id + "\">" + txt + "</a>";
                            break;
                        case (tagNumber < previous) : //it means that we went up but we don't know how much levels  (e.g. from h3 to h2)
                            while (tagNumber != previous) {
                                appHTML = appHTML + "</" + options.listType + "></li>";
                                previous--;
                            }
                            appHTML = appHTML + "<li>" + before + "<a href=\"#" + id + "\">" + txt + "</a></li>";
                            break;
                    }
                    i++;
                }
            });
            //corrects our last item, because it may have some opened ul's
            while (tagNumber != options.start) {
                appHTML = appHTML + "</" + options.listType + ">";
                tagNumber--;
            }
            //append our html to our object
            appHTML = options.stocTitle + "<" + options.listType + ">" + appHTML + "</" + options.listType + ">";
            obj.append(appHTML);

            //our pretty smooth scrolling here
            // acctually I've just compressed the code so you guys will think that I'm the man . Source: http://css-tricks.com/snippets/jquery/smooth-scrolling/
            if (options.smoothScroll == 1) {
                $(window).load(function () {
                    function filterPath(string) {
                        return string.replace(/^\//, '').replace(/(index|default).[a-zA-Z]{3,4}$/, '').replace(/\/$/, '')
                    }

                    var locationPath = filterPath(location.pathname);
                    var scrollElem = scrollableElement('html', 'body');
                    obj.find('a[href*=#]').each(function () {
                        var thisPath = filterPath(this.pathname) || locationPath;
                        if (locationPath == thisPath && (location.hostname == this.hostname || !this.hostname) && this.hash.replace(/#/, '')) {
                            var $target = $(this.hash), target = this.hash;
                            if (target) {
                                var targetOffset = $target.offset().top;
                                $(this).click(function (event) {
                                    event.preventDefault();
                                    $(scrollElem).animate({scrollTop: targetOffset}, 400, function () {
                                        location.hash = target
                                    })
                                })
                            }
                        }
                    });
                    function scrollableElement(els) {
                        for (var i = 0, argLength = arguments.length; i < argLength; i++) {
                            var el = arguments[i], $scrollElement = $(el);
                            if ($scrollElement.scrollTop() > 0) {
                                return el
                            } else {
                                $scrollElement.scrollTop(1);
                                var isScrollable = $scrollElement.scrollTop() > 0;
                                $scrollElement.scrollTop(0);
                                if (isScrollable) {
                                    return el
                                }
                            }
                        }
                        return[]
                    }
                });
            }
        };
    };
})(jQuery);