/* tests whether to run the cross-fade slide show or display static images */

var agt = navigator.userAgent.toLowerCase();
var appVer = navigator.appVersion.toLowerCase();


/* test for Safari 2 for Mac (WebKit 412 or greater) */
var isSafari = ((agt.indexOf('safari')!=-1)&&(agt.indexOf('mac')!=-1))?true:false;
if (isSafari !=-1) {
   var safariIndex = agt.indexOf('applewebkit\/');
   safariVersion = parseInt(agt.substring(safariIndex+12,safariIndex+17));
}


/* test for Firefox 1.5 or greater */
var isFirefox = (agt.indexOf('firefox\/')!=-1);
if (isFirefox !=-1) {
   var fxIndex = agt.indexOf('firefox\/');
   fxVersion = parseFloat(agt.substring(fxIndex+8,fxIndex+11));
}


/* test for Opera 9 or greater */
var isOpera = (agt.indexOf('opera\/')!=-1);
if (isOpera !=-1) {
   var opIndex = agt.indexOf('opera\/');
   opVersion = parseInt(agt.substring(opIndex+6,opIndex+7));
}


/* test for IE 6 or greater */
isIE = (agt.indexOf('msie')!=-1);
if ((isIE !=-1)) {
   var ieIndex  = agt.indexOf('msie');
   ieVersion = parseInt(agt.substring(ieIndex+5,ieIndex+6));
}


/* test for Safari 2, Firefox 1.5, Opera 9, or IE 6 */
var cf_okay = (isIE && (ieVersion >= 6) == true) || (isFirefox && (fxVersion >= 1.5) == true) || (isSafari && (safariVersion >= 412) == true) || (isOpera && (opVersion >= 9) == true);



/* for the cross-fade slide show */


/*  author:  Timothy Groves - http://www.brandspankingnew.net
 *  version: 1.3 - 2006-11-02
 *           1.2 - 2006-11-01
 *           1.1 - 2006-09-29
 *           1.0 - 2006-09-25
 *
 *  requires:  nothing
 */


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;
}