$(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 = 0; /* 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-1, opacity: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.
	 */
	cycleLayers();
	
	/**
	 * set all external links with target blank
	 */
	$('a[rel="external"]').attr('target','_blank');
});