(function($){
	$(function(){
		// optional images array, if empty will use just the elements already in slideshow div.
		var delay = 5000; /* Delay between animations */
		var fade = 1800; /* Duration of fade in animation */
		var curLayer = 'rand'; /* start from layer number */
		var zIndex = 2; /* z-index value. layers will use this value +/- 1 either side */
		/**
		 * Get childNode elements to be cycled though. Initialize with lowest zindex and 0 opacity.
		 */
		var layers = $('#slideshow').children().each(function(){
			$(this).css({zIndex: zIndex, opacity:0});
		});
		/**
		 * If curlayer is rand
		 */
		curLayer = curLayer == 'rand'? Math.floor(Math.random()*layers.length) : 0;
		/**
		 * Bring Layer to front and Fade in Animation with callback to cycleLayers.
		 */
		var fadeInLayer = function(i){
			$(layers[i]).css({zIndex:zIndex+1}).animate({'opacity':1}, fade, cycleLayers);
		}
		/**
		 * Calculate next image, current image and previous image and layer zindex and opacity accordingly
		 */
		var cycleLayers = function(){
			var l = layers.length, c = curLayer;
			$(layers[c<=0?l-1:c-1]).css({opacity:0, zIndex:zIndex-1});
			$(layers[c=curLayer=c>=l?0:c]).css({opacity:1,zIndex:zIndex});
			setTimeout(function(){ fadeInLayer(c+1==l?0:c+1); ++curLayer;}, delay);
		}
		/**
		 * Start the cycle layer process.
		 */
		if(layers.length > 1) cycleLayers(); else layers.css('opacity',1);
		
	});
})(jQuery);