// when the DOM is ready...

$(document).ready(function() {

    var $panels = $('#slider .scrollContainer > div');
    $panels.each(function(i, el) {
        el._index = i;
    });
    var $container = $('#slider .scrollContainer');

    // if false, we'll float all the panels left and fix the width
    // of the container
    var horizontal = true;

    // float the panels left if we're going horizontal
    if (horizontal) {
        $panels.css({
            'float': 'left',
            'position': 'relative' // IE fix to ensure overflow is hidden
        });

        // calculate a new width for the container (so it holds all panels)
        $container.css('width', $panels[0].offsetWidth * $panels.length);
    }

    // collect the scroll object, at the same time apply the hidden overflow
    // to remove the default scrollbars that will appear
    var $scroll = $('#slider .scroll').css('overflow', 'hidden');

    // apply our left + right buttons
    // handle nav selection
    function selectNav() {
        $('#tabset').find('a').parent().removeClass('current');
        $(this).parent().addClass('current');
        $(this).parent().click();

    }

    $('#tabset').find('a').click(selectNav);
    $("#next").hide();

    // go find the navigation link that has this target and select the nav
    function trigger(data) {
        var el = $('#tabset').find('a[href$="' + data.id + '"]').get(0);
        selectNav.call(el);
        if (data._index == 0) {
            $("#prev").show();
            $("#next").hide();
        }
        else if (data._index == ($panels.length - 1)) {
            $("#next").show();
            $("#prev").hide();
        }
        else {
            $("#prev").show();
            $("#next").show();
        }

    }

    if (window.location.hash) {
        trigger({ id: window.location.hash.substr(1) });
    } else {
        $('#tabset a:first').click();
    }

    // offset is used to move to *exactly* the right place, since I'm using
    // padding on my example, I need to subtract the amount of padding to
    // the offset.  Try removing this to get a good idea of the effect
    var offset = parseInt((horizontal ?
        $container.css('paddingTop') :
        $container.css('paddingLeft'))
        || 0) * -1;


    var scrollOptions = {
        target: $scroll, // the element that has the overflow

        // can be a selector which will be relative to the target
        items: $panels,

        navigation: '#tabset a',

        // selectors are NOT relative to document, i.e. make sure they're unique
        prev: '#next',
        next: '#prev',

        // allow the scroll effect to run both directions
        axis: 'xy',

        onAfter: trigger, // our final callback

        offset: offset,

        // duration of the sliding effect
        duration: 500,

        // easing - can be used with the easing plugin:
        // http://gsgd.co.uk/sandbox/jquery/easing/
        easing: 'swing'
    };

    // apply serialScroll to the slider - we chose this plugin because it
    // supports// the indexed next and previous scroll along with hooking
    // in to our navigation.
    $('#slider').serialScroll(scrollOptions);

    // now apply localScroll to hook any other arbitrary links to trigger
    // the effect
    $.localScroll(scrollOptions);

    // finally, if the URL has a hash, move the slider in to position,
    // setting the duration to 1 because I don't want it to scroll in the
    // very first page load.  We don't always need this, but it ensures
    // the positioning is absolutely spot on when the pages loads.
    scrollOptions.duration = 1;
    $.localScroll.hash(scrollOptions);

});