Extended jQuery UI Tabs

HTML

<link rel="stylesheet" href="http://static-stage.maklarpaket.se/admin/css/jquery-ui-custom.css">
<script src="https://raw.github.com/brandonaaron/jquery-mousewheel/master/jquery.mousewheel.js"></script>
<script type="text/javascript" src="http://jqueryui.com/themeroller/themeswitchertool/"></script>
<header>jizmoz<span>by mekwall</span></header>
<article>
    
    <h1 class="has-sub">Jizmoz Tabs</h1>
    <h3>Extending jQuery UI Tabs</h3>
    <br>
    
    <p>This plugin extends jQuery UI Tabs with the following features:</p>
   
    <br>
    
   
    <br><br>
    <div id="tabs">
        <ul>
            <li><a href="#tabs-1">Nunc tincidunt</a></li>
            <li><a href="#tabs-2">Proin dolor</a></li>
            <li><a href="#tabs-3">Aenean lacinia</a></li>
            <li><a href="#tabs-4">Nunc tincidunt</a></li>
            <li><a href="#tabs-5">Proin dolor</a></li>
            <li><a href="#tabs-6">Aenean lacinia</a></li>
            <li><a href="#tabs-7">Nunc tincidunt</a></li>
            <li><a href="#tabs-8">Proin dolor</a></li>
            <li><a href="#tabs-9">Aenean lacinia</a></li>
            <li><a href="#tabs-10">Nunc tincidunt</a></li>
            <li><a href="#tabs-11">Proin dolor</a></li>
            <li><a href="#tabs-12">Aenean lacinia</a></li>
        </ul>
        <div id="tabs-1">
            <p>Proin elit arcu, rutrum commodo, vehicula tempus, commodo a, risus. Curabitur nec arcu. Donec sollicitudin mi sit amet mauris. Nam elementum quam ullamcorper ante. Etiam aliquet massa et lorem. Mauris dapibus lacus auctor risus. Aenean tempor ullamcorper leo. Vivamus sed magna quis ligula eleifend adipiscing. Duis orci. Aliquam sodales tortor vitae ipsum. Aliquam nulla. Duis aliquam molestie erat. Ut et mauris vel pede varius sollicitudin. Sed ut dolor nec orci tincidunt interdum. Phasellus ipsum. Nunc tristique tempus lectus.</p>
        </div>
        <div id="tabs-2">
            <p>Morbi tincidunt, dui sit amet facilisis feugiat, odio metus...

CSS

@import url(http://fonts.googleapis.com/css?family=Ubuntu:300);

body, html {
    font-family: Calibri,Verdana,Arial,sans-serif;
    border: 0;
    margin: 0;
    padding: 0;
}

h1,
h2,
h3 {
    font-family: Ubuntu;
    line-height: 1.5;
    margin-bottom: .5em;
}

h1 {
    font-size: 2em;
}

h1.has-sub {
    margin-bottom: 0;
}

h2 {
    font-size: 1.3em;
}

ul {
    list-style: disc;
    margin-left: 1.5em;
    margin-top: .5em;
    margin-bottom: .5em;
    line-height: 1.4;
}

p {
    line-height: 1.4;
    margin-bottom: .5em;
}

header {
    background: rgb(76,76,76); /* Old browsers */
    background: -moz-linear-gradient(top, rgba(76,76,76,1) 1%, rgba(63,63,63,1) 100%); /* FF3.6+ */
    background: -webkit-gradient(linear, left top, left bottom, color-stop(1%,rgba(76,76,76,1)), color-stop(100%,rgba(63,63,63,1))); /* Chrome,Safari4+ */
    background: -webkit-linear-gradient(top, rgba(76,76,76,1) 1%,rgba(63,63,63,1) 100%); /* Chrome10+,Safari5.1+ */
    background: -o-linear-gradient(top, rgba(76,76,76,1) 1%,rgba(63,63,63,1) 100%); /* Opera11.10+ */
    background: -ms-linear-gradient(top, rgba(76,76,76,1) 1%,rgba(63,63,63,1) 100%); /* IE10+ */
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#4c4c4c', endColorstr='#3f3f3f',GradientType=0 ); /* IE6-9 */
    background: linear-gradient(top, rgba(76,76,76,1) 1%,rgba(63,63,63,1) 100%); /* W3C */
    padding: .2em 1.2em;
    font-family: Ubuntu;
    font-size: 1.3em;
    color: #999;
    text-shadow: -1px -1px 0 #333;
    text-align: right;
    box-shadow: 0 0 50px 20px rgba(0,0,0,.1);
    border-bottom: 1px solid #fff;
}

header span {
    margin-left: .3em;
    font-size: .6em;
}

article {
    padding: 20px;
}

.columns {
    padding: 2em;
    -webkit-column-count: 3;
    -webkit-column-gap: 5em;
    -webkit-column-rule: 1px dashed #ccc;
    column-count: 2;
    column-rule: 1px dashed #ccc;
    border: 1px solid #ccc;
    -webkit-border-radius: 10px;
    -moz-border-radius: 10px;
   ...

JavaScript

(function($, undefined) {
    if (!$.xui) {
        $.xui = {};
    }
    var tabs = $.extend({}, $.ui.tabs.prototype),
        _super = {
            _create: tabs._create,
            _destroy: tabs._destroy,
            _update: tabs._update
        };
    $.xui.tabs = $.extend(tabs, {
        options: $.extend({}, tabs.options, {
            scrollable: false,
            changeOnScroll: false,
            closable: false,
            resizable: false,
            resizeHandles: "e,s,se"
        }),
        _create: function() {
            var self = this,
                o = self.options;
            _super._create.apply(self);
            if (o.scrollable) {
                self.element.addClass("ui-tabs-scrollable");
                var scrollContainer = $('<div class="ui-tabs-scroll-container"></div>').prependTo(this.element);
                self.header = $('<div class="ui-tabs-nav-scrollable ui-widget-header ui-corner-all"></div>').prependTo(scrollContainer);
                var nav = self.element.find(".ui-tabs-nav:first").removeClass("ui-widget-header ui-corner-all").appendTo(this.header);
                var arrowsNav = $('<ol class="ui-helper-reset ui-helper-clearfix ui-tabs-nav-arrows"></ol>').prependTo(self.element);
                var navPrev = $('<li class="ui-tabs-arrow-previous ui-state-default ui-corner-bl ui-corner-tl" title="Previous"><a href="#"><span class="ui-icon ui-icon-carat-1-w">Previous tab</span></a></li>').prependTo(arrowsNav).hide(),
                    navNext = $('<li class="ui-tabs-arrow-next ui-state-default ui-corner-tr ui-corner-br" title="Next"><a href="#"><span class="ui-icon ui-icon-carat-1-e">Next tab</span></a></li>').appendTo(arrowsNav).hide();
                
                
                var scrollTo = function(to, delay) {
                    var navWidth = 0,
                        arrowWidth = navPrev.outerWidth(),
                        marginLeft = -(parseInt(nav.css("marginLeft"), 10)),
               ...