// JavaScript Document
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++){
		if(i!=0 && document.getElementById(divs[i])){ 
		   document.getElementById(divs[i]).style.display = "block"; 
	    }
		document.getElementById(divs[i]).style.opacity = 0;
		document.getElementById(divs[i]).style.position = "absolute";//static
		document.getElementById(divs[i]).style.filter = "alpha(opacity=0)";
		document.getElementById(divs[i]).style.visibility = "hidden";
		document.getElementById(divs[i]).style.textAlign = "center";
	}
	
	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;
	document.getElementById( this.aDivs[this.nAct] ).style.visibility = "visible";
	
	this.nInt = 10; //tiempo de difuminado default: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 op = this._easeInOut(this.nTime, 0, 1, this.nDur);
	var ieop = op*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;
}
/*********************************************************************************************************************************/
/*var cf = new Crossfader( new Array('cf1','cf2'), 500, 2000 );*/
/*********************************************************************************************************************************/