/*
crossfader.js
originally by Timothy Groves (http://www.brandspankingnew.net)
v1.3 (edited)
*/

// add stylesheet
(function (){
	var head = document.getElementsByTagName("head")[0];
	if (head) {
		var scriptStyles = document.createElement("link");
		scriptStyles.rel = "stylesheet";
		scriptStyles.type = "text/css";
		scriptStyles.href = "css/crossfader.css";
		head.appendChild(scriptStyles);
	}
}());

// crossfader
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;}

/* ---- Crossfader Variables: ----
	1. array of the id's of the tags to be faded
	2. fade time (in milliseconds)
	3. delay between fades (in milliseconds)
*/

// Randomize the order of the array
function randomOrder(){ return (Math.round(Math.random())-0.5); }
randomArray = new Array('pic01','pic02','pic03','pic04','pic05','pic06','pic07');
//randomArray.sort( randomOrder );

var cf = new Crossfader(randomArray, 1500, 3500);