(function($){

var $$;

$$ = $.fn.gallery = function($options) {
	
	
	if (!$$.hasCSS()) { return false; }
	
	
	var $defaults = {
		insert      : '.large-preview',
		clickNext   : true,
		onImage     : function(image,caption,thumb) {},
		onThumb     : function(thumb) {}
	};
	

	var $opts = $.extend($defaults, $options);
	
	
	for (var i in $opts) {
		$.gallery[i]  = $opts[i];
	}
	
	
	var _insert = ( $($opts.insert).is($opts.insert) ) ? 
		$($opts.insert) : 
		jQuery(document.createElement('div')).insertBefore(this);
		
	
	var _div = $(document.createElement('div')).addClass('main-image');
	
	
	var _span = $(document.createElement('span')).addClass('caption');
	

	_insert.addClass('large-preview').append(_div).append(_span);
	
	
	
	return this.each(function(){
		
	
		$(this).addClass('gallery');
	
	
		$(this).children('li').each(function(i) {
			
	
			var _container = $(this);
			                
	
			var _o = $.meta ? $.extend({}, $opts, _container.data()) : $opts;
			
	
			_o.clickNext = $(this).is(':only-child') ? false : _o.clickNext;
			
			
			var _a = $(this).find('a').is('a') ? $(this).find('a') : false;
			
			
			var _img = $(this).children('img').css('display','none');
			
			
			var _src = _a ? _a.attr('href') : _img.attr('src');
			
		
			var _title = _a ? _a.attr('title') : _img.attr('title');
			
		
			var _loader = new Image();
			
		
		
			$(_loader).load(function () {
				
	
				$(this).attr('alt',_img.attr('alt'));
				
				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 { 
					
					window.setTimeout(function() {
						_thumb.css({
							marginLeft: -( _thumb.width() - _container.width() )/2, 
							marginTop:  -( _thumb.height() - _container.height() )/2
						});
					}, 1);
				}
				

				_thumb.attr('rel',_src);
				
	
				_thumb.attr('title',_title);
				
				
				_thumb.click(function() {
					$.gallery.activate(_src);
				});
				
				
				_thumb.hover(
					function() { $(this).addClass('hover'); },
					function() { $(this).removeClass('hover'); }
				);
				_container.hover(
					function() { _container.addClass('hover'); },
					function() { _container.removeClass('hover'); }
				);

				
				_container.prepend(_thumb);
				
				
				_thumb.css('display','block');
				
				
				_o.onThumb(jQuery(_thumb));
				
				
				if (_container.hasClass('active')) {
					$.gallery.activate(_src);
				
				}
				
				
				_img.remove();
				
			}).error(function () {
				
				
			    _container.html('<span class="error" style="color:red">Error loading image: '+_src+'</span>');
			
			}).attr('src', _src);
		});
	});
};


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



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



$$.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;
};



$$.onPageLoad = function(_src) {	
	
	
	var _wrapper = $('.main-image');
	
	
	var _thumb = $('.gallery img[@rel="'+_src+'"]');
	
	if (_src) {
		
	
	
	
		_thumb.parents('li').siblings('.active').removeClass('active');
		_thumb.parents('li').addClass('active');
	
	
		var _img   = $(new Image()).attr('src',_src).addClass('replaced');

	
		_wrapper.empty().append(_img);

		_wrapper.siblings('.caption').text(_thumb.attr('title'));
		
		$.gallery.onImage(_img,_wrapper.siblings('.caption'),_thumb);
		
		if($.gallery.clickNext) {
			_img.css('cursor','pointer').click(function() { $.gallery.next(); })
		}
		
	} else {
		
		_wrapper.siblings().andSelf().empty();
		
		$('.gallery li.active').removeClass('active');
	}

	$.gallery.current = _src;
	
}

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

})(jQuery);