/* Timothy Groves - brandspankingnew.net */
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;
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) * 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;}