/**
 *  author:		Luca Milvio - http://www.natronize.it
 *	version:	0.1 - 01-03-2009
 */


//MODIFICA aggiungo una variabile che indica il numero di immagini presenti nella directory e qual'è il nome delle immagini
var numImg = 34;
var idImg='a';
var oldIdImg='b';
//FINE

var useBSNns;

if (useBSNns)
{
	if (typeof(bsn) == "undefined")
		bsn = {}
	var _bsn = bsn;
}
else
{
	var _bsn = this;
}





_bsn.Crossfader = function (divs, fadetime, delay )
{	
	this.nAct = -1;
	this.aDivs = divs;
	
	for (var i=0;i<divs.length;i++)
	{
		document.getElementById(divs[i]).style.opacity = 0;
		document.getElementById(divs[i]).style.position = "absolute";
		document.getElementById(divs[i]).style.filter = "alpha(opacity=0)";
		document.getElementById(divs[i]).style.visibility = "hidden";
	}
	
	this.nDur = fadetime;
	this.nDelay = delay;
		
	this._newfade();
}


_bsn.Crossfader.prototype._newfade = function()
{
	if (this.nID1)
		clearInterval(this.nID1);
	
	this.nOldAct = this.nAct;
	this.nAct++;

	if (!this.aDivs[this.nAct])	this.nAct = 0;

	//MODIFICA	definisco il div successivo per poter cambiare immagine e cambio immagine
	this.nNext = this.nAct+1;
	if (!this.aDivs[this.nNext])	this.nNext = 0;

	//FINE MODIFICA
	
	if (this.nAct == this.nOldAct)
		return false;
    //MODIFICA routine randomizza immagine e cambio immagine sfondo div
		//controllo non ci siano ripetizioni di immagini
	oldIdImg = idImg;
	do {
	idImg = Math.round(Math.random() * (numImg - 1)); }
	while (oldIdImg == idImg);
		urlo="url(menuimg/logo"+idImg+".png)";
	document.getElementById( this.aDivs[this.nNext] ).style.backgroundImage=urlo;
	/*document.getElementById( this.aDivs[this.nNext] ).innerHTML='controllo: logo'+idImg;*/
	//FINE MODIFICA
	
	document.getElementById( this.aDivs[this.nAct] ).style.visibility = "visible";

	this.nInt = 50;
	this.nTime = 0;
	
	var p=this;
	this.nID2 = setInterval(function() { p._fade() }, this.nInt);
}


_bsn.Crossfader.prototype._fade = function()
{
	this.nTime += this.nInt;
	
	var ieop = Math.round( this._easeInOut(this.nTime, 0, 1, this.nDur) * 100 );
	var op = ieop / 100;
	document.getElementById( this.aDivs[this.nAct] ).style.opacity = op;
	document.getElementById( this.aDivs[this.nAct] ).style.filter = "alpha(opacity="+ieop+")";
	
	if (this.nOldAct > -1)
	{
		document.getElementById( this.aDivs[this.nOldAct] ).style.opacity = 1 - op;
		document.getElementById( this.aDivs[this.nOldAct] ).style.filter = "alpha(opacity="+(100 - ieop)+")";
	}
	
	if (this.nTime == this.nDur)
	{
		clearInterval( this.nID2 );
		
		if (this.nOldAct > -1)
			document.getElementById( this.aDivs[this.nOldAct] ).style.visibility = "hidden";	

		var p=this;
		this.nID1 = setInterval(function() { p._newfade() }, this.nDelay);
	}
}



_bsn.Crossfader.prototype._easeInOut = function(t,b,c,d)
{
	return c/2 * (1 - Math.cos(Math.PI*t/d)) + b;
}