/* This script and many more are available free online at
 The JavaScript Source!! http://javascript.internet.com
 Created by: Timothy Groves | http://www.brandspankingnew.net/ */
var useBSNns;
if (useBSNns) {
    if (typeof(bsn) == "undefined") 
        bsn = {}
    var _bsn = bsn;
}
else {
    var _bsn = this;
}
_bsn.Crossfader = function(divs, fadetime, delay, repeat){
    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.nRepeat = repeat;
    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.nRepeat != false) 
        this.nAct = 0;
    if (this.nAct == this.nOldAct) 
        return false;
	if(document.getElementById(this.aDivs[this.nAct]))
    	document.getElementById(this.aDivs[this.nAct]).style.visibility = "visible";
	else return;
    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;
}