var gblPhotoShufflerDivId = "photodiv";
var gblPhotoShufflerImgId = "photoimg";
var gblPauseSeconds = 4.00;
var gblFadeSeconds = 1.45;
var gblRotations = 100;

var gblDeckSize = gblImg.length;
var gblOpacity = 100;
var gblOnDeck = Math.ceil(numImmagini * Math.random())-1;
var gblStartImg;
var gblImageRotations = gblDeckSize * (gblRotations+1);

function photoShufflerLaunch() {
	var theimg = document.getElementById(gblPhotoShufflerImgId);
	gblStartImg = theimg.src; // save away to show as final image
	document.getElementById(gblPhotoShufflerDivId).style.backgroundImage='url(' + gblImg[gblOnDeck] + ')';
	photoShufflerFade()
}

function photoShufflerFade() {
	var theimg = document.getElementById(gblPhotoShufflerImgId);
	// determine delta based on number of fade seconds
	// the slower the fade the more increments needed
	var fadeDelta = 100 / (30 * gblFadeSeconds);
	// fade top out to reveal bottom image
	if (gblOpacity < 2*fadeDelta) {
		gblOpacity = 100;
		// stop the rotation if we're done
		if (gblImageRotations < 1) return;
		// prima di sostituire l'immagine verifica che la successiva sia caricata
		// DA FARE !!!
		photoShufflerShuffle();
		// pause before next fade
		setTimeout("photoShufflerFade()",gblPauseSeconds*1000); }
	else {
		gblOpacity -= fadeDelta;
		setOpacity(theimg,gblOpacity);
		setTimeout("photoShufflerFade()",30); // 1/30th of a second
	}
}

function photoShufflerShuffle() {
	var thediv = document.getElementById(gblPhotoShufflerDivId);
	var theimg = document.getElementById(gblPhotoShufflerImgId);
	theimg.src = gblImg[gblOnDeck];		// copy div background-image to img.src
	setOpacity(theimg,100);						// set img opacity to 100
	// shuffle the deck
	gblOnDeck = ++gblOnDeck % gblDeckSize;
	// decrement rotation counter
	if (--gblImageRotations < 1) {
		gblImg[gblOnDeck] = gblStartImg;				// insert start/final image if we're done
	}
	// slide next image underneath
	thediv.style.backgroundImage='url(' + gblImg[gblOnDeck] + ')';
}

function setOpacity(obj, opacity) {
	opacity = (opacity == 100)?99.999:opacity;
	obj.style.filter = "alpha(opacity:"+opacity+")";		// IE/Win
	obj.style.KHTMLOpacity = opacity/100;								// Safari<1.2, Konqueror
	obj.style.MozOpacity = opacity/100;									// Older Mozilla and Firefox
	obj.style.opacity = opacity/100;										// Safari 1.2, newer Firefox and Mozilla, CSS3
}

function movepic(img_name,img_src) {
	document[img_name].src=img_src;
}