(function($){
var $$;
$$ = $.fn.galleria = function($options) {
  
  // check for basic CSS support
  if (!$$.hasCSS()) { return false; }
  
  // init the modified history object
  $.historyInit($$.onPageLoad);
  
  // set default options
  var $defaults = {
	insert      : '.galleria_container',
	history     : true,
	clickNext   : true,
	onImage     : function(image,caption,thumb) {},
	onThumb     : function(thumb) {}
  };
  

  // extend the options
  var $opts = $.extend($defaults, $options);
  
  // bring the options to the galleria object
  for (var i in $opts) {
	if (i) {
	  $.galleria[i]  = $opts[i];
	}
  }
  
  // if no insert selector, create a new division and insert it before the ul
  var _insert = ( $($opts.insert).is($opts.insert) ) ? 
	$($opts.insert) : 
	jQuery(document.createElement('div')).insertBefore(this);
	
  // create a wrapping div for the image
  var _div = $(document.createElement('div')).addClass('galleria_wrapper').css("text-align", "center");
  
  // create a caption span
  var _span = $(document.createElement('span')).addClass('caption');
  
  // inject the wrapper in in the insert selector
  _insert.addClass('galleria_container').append(_div).append(_span);
  
  //-------------
  
  return this.each(function(){
	
	// add the Galleria class
	$(this).addClass('galleria');
	
	// loop through list
	$(this).children('li').each(function(i) {
	  
	  // bring the scope
	  var _container = $(this);
	                  
	  // build element specific options
	  var _o = $.meta ? $.extend({}, $opts, _container.data()) : $opts;
	  
	  // remove the clickNext if image is only child
	  _o.clickNext = $(this).is(':only-child') ? false : _o.clickNext;
	  
	  // try to fetch an anchor
	  var _a = $(this).find('a').is('a') ? $(this).find('a') : false;
	  
	  // reference the original image as a variable and hide it
	  var _img = $(this).children('img').css('display','none');
	  
	  // extract the original source
	  var _src = _a ? _a.attr('href') : _img.attr('src');
	  
	  // find a title
	  var _title = _a ? _a.attr('title') : _img.attr('title');
	  
	  // create loader image            
	  var _loader = new Image();
	  
	  // check url and activate container if match
	  if (_o.history && (window.location.hash && window.location.hash.replace(/\#/,'') == _src)) {
		_container.siblings('.active').removeClass('active');
		_container.addClass('active');
	  }
	
	  // begin loader
	  $(_loader).load(function () {
		
		// try to bring the alt
		$(this).attr('alt',_img.attr('alt'));
		
		//-----------------------------------------------------------------
		// the image is loaded, let's create the thumbnail
		
		var _thumb = _a ? 
		  _a.find('img').addClass('thumb noscale').css('display','none') :
		  _img.clone(true).addClass('thumb').css('display','none');
		
		if (_a) { _a.replaceWith(_thumb); }
		
		if (!_thumb.hasClass('noscale')) { // scaled tumbnails!
		  var w = Math.ceil( _img.width() / _img.height() * _container.height() );
		  var h = Math.ceil( _img.height() / _img.width() * _container.width() );
		  if (w < h) {
			_thumb.css({ height: 'auto', width: _container.width(), marginTop: -(h-_container.height())/2 });
		  } else {
			_thumb.css({ width: 'auto', height: _container.height(), marginLeft: -(w-_container.width())/2 });
		  }
		} else { // Center thumbnails.
		  // a tiny timer fixed the width/height
		  window.setTimeout(function() {
			_thumb.css({
			  marginLeft: -( _thumb.width() - _container.width() )/2, 
			  marginTop:  -( _thumb.height() - _container.height() )/2
			});
		  }, 1);
		}
		
		// add the rel attribute
		_thumb.attr('rel',_src);
		
		// add the title attribute
		_thumb.attr('title',_title);
		
		// add the click functionality to the _thumb
		_thumb.click(function() {
		  $.galleria.activate(_src);
		});
		
		// hover classes for IE6
		_thumb.hover(
		  function() { $(this).addClass('hover'); },
		  function() { $(this).removeClass('hover'); }
		);
		_container.hover(
		  function() { _container.addClass('hover'); },
		  function() { _container.removeClass('hover'); }
		);

		// prepend the thumbnail in the container
		_container.prepend(_thumb);
		
		// show the thumbnail
		_thumb.css('display','block');
		
		// call the onThumb function
		_o.onThumb(jQuery(_thumb));
		
		// check active class and activate image if match
		if (_container.hasClass('active')) {
		  $.galleria.activate(_src);
		  //_span.text(_title);
		}
		
		//-----------------------------------------------------------------
		
		// finally delete the original image
		_img.remove();
		
	  }).error(function () {
		
		// Error handling
	      _container.html('<span class="error" style="color:red">Error loading image: '+_src+'</span>');
	  
	  }).attr('src', _src);
	});
  });
};

/**
 *
 * @name NextSelector
 *
 * @desc Returns the sibling sibling, or the first one
 *
**/

$$.nextSelector = function(selector) {
  return $(selector).is(':last-child') ?
	   $(selector).siblings(':first-child') :
  	   $(selector).next();
  	   
};

/**
 *
 * @name previousSelector
 *
 * @desc Returns the previous sibling, or the last one
 *
**/

$$.previousSelector = function(selector) {
  return $(selector).is(':first-child') ?
	   $(selector).siblings(':last-child') :
  	   $(selector).prev();
  	   
};

/**
 *
 * @name hasCSS
 *
 * @desc Checks for CSS support and returns a boolean value
 *
**/

$$.hasCSS = function()  {
  $('body').append(
	$(document.createElement('div')).attr('id','css_test').css({ width:'1px', height:'1px', display:'none' })
  );
  var _v = ($('#css_test').width() != 1) ? false : true;
  $('#css_test').remove();
  return _v;
};

/**
 *
 * @name onPageLoad
 *
 * @desc The function that displays the image and alters the active classes
 *
 * Note: This function gets called when:
 * 1. after calling $.historyInit();
 * 2. after calling $.historyLoad();
 * 3. after pushing "Go Back" button of a browser
 *
**/

$$.onPageLoad = function(_src) {	
  
  // get the wrapper
  var _wrapper = $('.galleria_wrapper');
  
  // get the thumb
  var _thumb = $('.galleria img[rel="'+_src+'"]');
  
  if (_src) {
	
	// new hash location
	if ($.galleria.history) {
	  window.location = window.location.href.replace(/\#.*/,'') + '#' + _src;
	}
	
	// alter the active classes
	_thumb.parents('li').siblings('.active').removeClass('active');
	_thumb.parents('li').addClass('active');
  
	// define a new image
	var _img   = $(new Image()).attr('src',_src).addClass('replaced');

	// empty the wrapper and insert the new image
	_wrapper.empty().append(_img);

	// insert the caption
	_wrapper.siblings('.caption').text(_thumb.attr('title'));
	
	// fire the onImage function to customize the loaded image's features
	$.galleria.onImage(_img,_wrapper.siblings('.caption'),_thumb);
	
	// add clickable image helper
	if($.galleria.clickNext) {
	  _img.css('cursor','pointer').click(function() { $.galleria.next(); });
	}
	
  } else {
	
	// clean up the container if none are active
	_wrapper.siblings().andSelf().empty();
	
	// remove active classes
	$('.galleria li.active').removeClass('active');
  }

  // place the source in the galleria.current variable
  $.galleria.current = _src;
  
};

$.extend({galleria : {
  current : '',
  onImage : function(){},
  activate : function(_src) { 
	if ($.galleria.history) {
	  $.historyLoad(_src);
	} else {
	  $$.onPageLoad(_src);
	}
  },
  next : function() {
	var _next = $($$.nextSelector($('.galleria img[rel="'+$.galleria.current+'"]').parents('li'))).find('img').attr('rel');
	$.galleria.activate(_next);
  },
  prev : function() {
	var _prev = $($$.previousSelector($('.galleria img[rel="'+$.galleria.current+'"]').parents('li'))).find('img').attr('rel');
	$.galleria.activate(_prev);
  }
}
});

})(jQuery);

jQuery.extend({
  historyCurrentHash: undefined,
  
  historyCallback: undefined,
  
  historyInit: function(callback){
	jQuery.historyCallback = callback;
	var current_hash = location.hash;
	
	jQuery.historyCurrentHash = current_hash;
	if(jQuery.browser.msie) {
	  // To stop the callback firing twice during initilization if no hash present
	  if (jQuery.historyCurrentHash === '') {
	  jQuery.historyCurrentHash = '#';
	}
	
	  // add hidden iframe for IE
	  $("body").prepend('<iframe id="jQuery_history" style="display: none;"></iframe>');
	  var ihistory = $("#jQuery_history")[0];
	  var iframe = ihistory.contentWindow.document;
	  iframe.open();
	  iframe.close();
	  iframe.location.hash = current_hash;
	}
	else if ($.browser.safari) {
	  // etablish back/forward stacks
	  jQuery.historyBackStack = [];
	  jQuery.historyBackStack.length = history.length;
	  jQuery.historyForwardStack = [];
	  
	  jQuery.isFirst = true;
	}
	jQuery.historyCallback(current_hash.replace(/^#/, ''));
	setInterval(jQuery.historyCheck, 100);
  },
  
  historyAddHistory: function(hash) {
	// This makes the looping function do something
	jQuery.historyBackStack.push(hash);
	
	jQuery.historyForwardStack.length = 0; // clear forwardStack (true click occured)
	this.isFirst = true;
  },
  
  historyCheck: function(){
	if(jQuery.browser.msie) {
	  // On IE, check for location.hash of iframe
	  var ihistory = $("#jQuery_history")[0];
	  var iframe = ihistory.contentDocument || ihistory.contentWindow.document;
	  var current_hash = iframe.location.hash;
	  if(current_hash != jQuery.historyCurrentHash) {
	  
		location.hash = current_hash;
		jQuery.historyCurrentHash = current_hash;
		jQuery.historyCallback(current_hash.replace(/^#/, ''));
		
	  }
	} else if ($.browser.safari) {
	  if (!jQuery.dontCheck) {
		var historyDelta = history.length - jQuery.historyBackStack.length;
		
		if (historyDelta) { // back or forward button has been pushed
		  jQuery.isFirst = false;
		  var i;
		  if (historyDelta < 0) { // back button has been pushed
			// move items to forward stack
			for (i = 0; i < Math.abs(historyDelta); i++) {
			  jQuery.historyForwardStack.unshift(jQuery.historyBackStack.pop());
			}
		  } else { // forward button has been pushed
			// move items to back stack
			for (i = 0; i < historyDelta; i++) {
			  jQuery.historyBackStack.push(jQuery.historyForwardStack.shift());
			}
		  }
		  var cachedHash = jQuery.historyBackStack[jQuery.historyBackStack.length - 1];
		  if (cachedHash !== undefined) {
			jQuery.historyCurrentHash = location.hash;
			jQuery.historyCallback(cachedHash);
		  }
		} else if (jQuery.historyBackStack[jQuery.historyBackStack.length - 1] === undefined && !jQuery.isFirst) {
		  // back button has been pushed to beginning and URL already pointed to hash (e.g. a bookmark)
		  // document.URL doesn't change in Safari
		  if (document.URL.indexOf('#') >= 0) {
			jQuery.historyCallback(document.URL.split('#')[1]);
		  } else {
			current_hash = location.hash;
			jQuery.historyCallback('');
		  }
		  jQuery.isFirst = true;
		}
	  }
	} else {
	  // otherwise, check for location.hash
	  current_hash = location.hash;
	  if(current_hash != jQuery.historyCurrentHash) {
		jQuery.historyCurrentHash = current_hash;
		jQuery.historyCallback(current_hash.replace(/^#/, ''));
	  }
	}
  },
  historyLoad: function(hash){
	var newhash;
	
	if (jQuery.browser.safari) {
	  newhash = hash;
	}
	else {
	  newhash = '#' + hash;
	  location.hash = newhash;
	}
	jQuery.historyCurrentHash = newhash;
	
	if(jQuery.browser.msie) {
	  var ihistory = $("#jQuery_history")[0];
	  var iframe = ihistory.contentWindow.document;
	  iframe.open();
	  iframe.close();
	  iframe.location.hash = newhash;
	  jQuery.historyCallback(hash);
	}
	else if (jQuery.browser.safari) {
	  jQuery.dontCheck = true;
	  // Manually keep track of the history values for Safari
	  this.historyAddHistory(hash);
	  
	  // Wait a while before allowing checking so that Safari has time to update the "history" object
	  // correctly (otherwise the check loop would detect a false change in hash).
	  var fn = function() {jQuery.dontCheck = false;};
	  window.setTimeout(fn, 200);
	  jQuery.historyCallback(hash);
	  // N.B. "location.hash=" must be the last line of code for Safari as execution stops afterwards.
	  //      By explicitly using the "location.hash" command (instead of using a variable set to "location.hash") the
	  //      URL in the browser and the "history" object are both updated correctly.
	  location.hash = newhash;
	}
	else {
	  jQuery.historyCallback(hash);
	}
  }
});