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

	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 = false;
	
	// 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');
	
	
	// 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;
	
	
	
	// Bind the navigation clicks to update the selected nav
	$('#slider .navigation').find('a').click(selectNav);
	
	// Handle nav selection
	function selectNav() {
		$(this)
			.parents('ul:first') // find the first UL parent
				.find('a') // find all the <a> elements
					.removeClass('selected') // remove from all
				.end() // go back to all <a> elements
			.end() // go back to 'this' element
			.addClass('selected'); // _this_ nav is selected!
	}
	
	function trigger(data) {
		// Within the .navigation element, find the <a> element
		// whose href ends with ID ($= is ends with)
		var element = $('#slider .navigation').find('a[href$="' + data.id + '"]').get(0);
		
		// We're passing the actual element, and not the jQuery instance.
		selectNav.call(element);
	}
	
	// On page load, check for has in URL, trigger selectNav
	// Default, load first tab in nav.
	if (window.location.hash) {
		trigger({ id : window.location.hash.substr(1) });
	} else {
		$('ul.navigation a:first').click();
	}
	
	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: 1000,
	  
	  // easing - can be used with the easing plugin: 
	  // http://gsgd.co.uk/sandbox/jquery/easing/
	  easing: 'easeOutCirc'
	};
	
	// 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);

});