var Pic = new Array(); // Array di immagini
var pos = 0; // Posizione corrente per il caricamento

var waitTime = 3000; // Timeout prima della dissolvenza
var j = 0; // Posizione corrente per la visualizzazione

function addSlide(slidePath) {
	Pic[ pos ] = slidePath;
	pos += 1;
	
	// Precarico le immagini
	var preLoad = new Image();
	preLoad.src = slidePath;
}

function fadeIn(objId,opacity) {
	if (document.getElementById) {
		obj = document.getElementById(objId);
		if (opacity <= 100) {
			setOpacity(obj, opacity);
			opacity += 10;
			window.setTimeout("fadeIn('"+objId+"',"+opacity+")", 100);
		} else {
			// Comincio la dissolvenza dopo 3000 millisecondi
			sleep(waitTime, objId, 110);
		}
	}
}
function fadeOut(objId,opacity) {
	if (document.getElementById) {
		obj = document.getElementById(objId);
		if (opacity >= 10) {
			setOpacity(obj, opacity);
			opacity -= 10;
			window.setTimeout("fadeOut('"+objId+"',"+opacity+")", 100);
		} else {
			// Comincio subito a far comparire l'immagine successiva
			j = j + 1;
			if (j > (Pic.length-1)) j=0;
			obj.src = Pic[ j ];
			setOpacity(obj, 0);
			window.setTimeout("fadeIn('"+objId+"',"+opacity+")", 0);
		}
	}
}
function setOpacity(obj, opacity) {
	opacity = (opacity == 100)?99.999:opacity;
	// IE/Win
	obj.style.filter = "alpha(opacity:"+opacity+")";
	// Safari<1.2, Konqueror
	obj.style.KHTMLOpacity = opacity/100;
	// Older Mozilla and Firefox
	obj.style.MozOpacity = opacity/100;
	// Safari 1.2, newer Firefox and Mozilla, CSS3
	obj.style.opacity = opacity/100;
}
// -->

function sleep(millis, objId, opacity) {
    setTimeout("fadeOut('"+objId+"',"+opacity+")", millis);
}