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

var this_;
var slock=0;

_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();
	this_=this;
}

_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;	
	if (this.nAct == this.nOldAct)
		return false;	
	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) * 1000 );
	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;
}

function cAct(t){

	clearInterval(cf.nID1);
	clearInterval(cf.nID2);

	cf.nAct=t;
	cf.nOldAct=-1;
	slock++;

	for(i=0;i<cf.aDivs.length;i++){	
		document.getElementById("cf"+i).style.visibility = "hidden";
		document.getElementById("cf"+i).style.opacity = 0;
		document.getElementById("cf"+i).style.filter = "alpha(opacity=0)";
	}

	dthis=document.getElementById("cf"+t).style;
	dthis.visibility = "visible";
	dthis.opacity = 100;
	dthis.filter = "alpha(opacity=100)";

	var stoplock=setInterval(function() {
		slock--;
		if(slock==0){
			this_._newfade();
		}
		clearInterval(stoplock);

	}, 10000);

}