// when the DOM is ready...
$(document).ready(function () {

    if($('#slider').length){

        var $panels = $('#slider .scrollContainer > div');
        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
        $scroll
          .before('<img class="scrollButtons left" src="/images/scroll_left.png" />')
          .after('<img class="scrollButtons right" src="/images/scroll_right.png" />');

        // handle nav selection
        function selectNav() {
          $(this)
            .parents('ul:first')
              .find('a')
                .removeClass('selected')
              .end()
            .end()
            .addClass('selected');
        }

        $('#slider .navigation').find('a').click(selectNav);

        // go find the navigation link that has this target and select the nav
        function trigger(data) {
          var el = $('#slider .navigation').find('a[href$="' + data.id + '"]').get(0);
          selectNav.call(el);
        }

        if (window.location.hash) {
          trigger({ id : window.location.hash.substr(1) });
        } else {
          $('ul.navigation 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: '.navigation a',
          
          // selectors are NOT relative to document, i.e. make sure they're unique
          prev: 'img.left', 
          next: 'img.right',
          
          // 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);
    }    

});