function isObject(a) {
    return (typeof a == 'object' && !!a) || isFunction(a);
}

function isAlien(a) {
   return isObject(a) && typeof a.constructor != 'function';
}
function isArray(a) {
    return isObject(a) && a.constructor == Array;
}
function isBoolean(a) {
    return typeof a == 'boolean';
}

function isEmpty(o) {
    if (isObject(o)) {
        for (var i in o) {
            return false;
        }
    }
    return true;
}

function isFunction(a) {
    return typeof a == 'function';
}
function isNull(a) {
    return typeof a == 'object' && !a;
}
function isNumber(a) {
    return typeof a == 'number' && isFinite(a);
}
function isString(a) {
    return typeof a == 'string';
}
function isUndefined(a) {
    return typeof a == 'undefined';
} 

/*
if (Array.prototype.push && ([0].push(true)==true))
        Array.prototype.push = null;

if(!Array.prototype.push) {

    function array_push() {
        for(i=0;i<arguments.length;i++){
            this[this.length] = arguments[i];
        }
        return this.length;
    }

    Array.prototype.push = array_push;

}
*/


var fadearray=new Array(); //array to cache fadeshow instances
var fadeclear=new Array(); //array to cache corresponding clearinterval pointers
var currentfade=new Array(); //array to cache corresponding fade pointers
 
var dom=(document.getElementById); //modern dom browsers
var iebrowser=document.all;
 
function fadeshow(theimages, fadewidth, fadeheight, borderwidth, delay, pause, displayorder)
{ 
    if (isArray(theimages[0][0])){theimages=theimages[0];} // if theimages is array of imagedefinitions, take the first one;
	this.pausecheck=pause;
	this.mouseovercheck=0;
	this.delay=delay;
	this.degree=10; //initial opacity degree (10%)
	this.curimageindex=0;
	this.nextimageindex=1;
	if (theimages.length==1){this.nextimageindex=0;}
	fadearray[fadearray.length]=this;
	this.slideshowid=fadearray.length-1;
	this.canvasbase="canvas"+this.slideshowid;
	this.curcanvas=this.canvasbase+"_0";
	if (typeof displayorder!="undefined")
	{theimages.sort(function() {return 0.5 - Math.random();});} //thanks to Mike (aka Mwinter) :)
	this.theimages=theimages;
	this.imageborder=parseInt(borderwidth);
	this.postimages=new Array(); //preload images
/*
	for (p=0;p<theimages.length;p++)
	{
		this.postimages[p]=new Image();
		this.postimages[p].src=theimages[p][0];
	}
*/
	fill_postimages(this, theimages);
	
	var fadewidth=fadewidth+this.imageborder*2;
	var fadeheight=fadeheight+this.imageborder*2;
 
	if (iebrowser&&dom||dom) //if IE5+ or modern browsers (ie: Firefox)
	{
		document.write('<div id="master'+this.slideshowid+'" style="position:relative;width:'+fadewidth+'px;height:'+fadeheight+'px;overflow:hidden;"><div id="'+this.canvasbase+'_0" style="position:absolute;width:'+fadewidth+'px;height:'+fadeheight+'px;top:0;left:0;filter:progid:DXImageTransform.Microsoft.alpha(opacity=10);-moz-opacity:10;-khtml-opacity:10;background-color:'+fadebgcolor+'"></div><div id="'+this.canvasbase+'_1" style="position:absolute;width:'+fadewidth+'px;height:'+fadeheight+'px;top:0;left:0;filter:progid:DXImageTransform.Microsoft.alpha(opacity=10);-moz-opacity:10;background-color:'+fadebgcolor+'"></div></div>');
	}
	else
	{
		document.write('<div><img name="defaultslide'+this.slideshowid+'" src="'+this.postimages[0].src+'"></div>');
	}
	 
	if (iebrowser&&dom||dom) //if IE5+ or modern browsers such as Firefox
	{
		this.startit();
	}
	else
	{
		this.curimageindex++;
		currentfade[this.slideshowid]=setInterval("fadearray["+this.slideshowid+"].rotateimage()", this.delay);
	}
}

function fadepic(obj)
{
	if (obj.degree<100)
	{
		obj.degree+=10;
		if (obj.tempobj.filters&&obj.tempobj.filters[0])
		{
			if (typeof obj.tempobj.filters[0].opacity=="number") //if IE6+
			{
				obj.tempobj.filters[0].opacity=obj.degree;
			}
			else //else if IE5.5-
			{
				obj.tempobj.style.filter="alpha(opacity="+obj.degree+")";
			}
		}
		else if (obj.tempobj.style.MozOpacity)
		{
			obj.tempobj.style.MozOpacity=obj.degree/101
		}
		else if (obj.tempobj.style.KhtmlOpacity)
		{
			obj.tempobj.style.KhtmlOpacity=obj.degree/100
		}
	}
	else
	{
		clearInterval(fadeclear[obj.slideshowid]);
		obj.nextcanvas=(obj.curcanvas==obj.canvasbase+"_0")? obj.canvasbase+"_0" : obj.canvasbase+"_1";
		obj.tempobj=iebrowser? iebrowser[obj.nextcanvas] : document.getElementById(obj.nextcanvas);
		obj.populateslide(obj.tempobj, obj.nextimageindex);
		obj.nextimageindex=(obj.nextimageindex<obj.postimages.length-1)? obj.nextimageindex+1 : 0;
		currentfade[obj.slideshowid]=setTimeout("fadearray["+obj.slideshowid+"].rotateimage()", obj.delay);
	}
}
 
fadeshow.prototype.populateslide=function(picobj, picindex)
{
	var slideHTML="";
	if (this.theimages[picindex][1]!="") //if associated link exists for image
	{
		slideHTML='<a href="'+this.theimages[picindex][1]+'" target="'+this.theimages[picindex][2]+'">';
	}
	slideHTML+='<img src="'+this.postimages[picindex].src+'" border="'+this.imageborder+'px">';
	if (this.theimages[picindex][1]!="") //if associated link exists for image
	{
		slideHTML+='</a>';
	}
	picobj.innerHTML=slideHTML;
}
 
 
fadeshow.prototype.rotateimage=function()
{
	if (this.pausecheck==1) //if pause onMouseover enabled, cache object
	{
		var cacheobj=this;
	}
	if (this.mouseovercheck==1)
	{
		setTimeout(function(){cacheobj.rotateimage()}, 100);
	}
	else if (iebrowser&&dom||dom)
	{
		this.resetit();
		var crossobj=this.tempobj=iebrowser? iebrowser[this.curcanvas] : document.getElementById(this.curcanvas);
		crossobj.style.zIndex++;
		fadeclear[this.slideshowid]=setInterval("fadepic(fadearray["+this.slideshowid+"])",100);
		this.curcanvas=(this.curcanvas==this.canvasbase+"_0")? this.canvasbase+"_1" : this.canvasbase+"_0";
	}
	else
	{
		var ns4imgobj=document.images['defaultslide'+this.slideshowid];
		ns4imgobj.src=this.postimages[this.curimageindex].src;
	}
	this.curimageindex=(this.curimageindex<this.postimages.length-1)? this.curimageindex+1 : 0;
}
 
fadeshow.prototype.resetit=function()
{
	this.degree=10;
	var crossobj=iebrowser? iebrowser[this.curcanvas] : document.getElementById(this.curcanvas);
	if (crossobj.filters&&crossobj.filters[0])
	{
		if (typeof crossobj.filters[0].opacity=="number") //if IE6+
		crossobj.filters(0).opacity=this.degree
		else //else if IE5.5-
		crossobj.style.filter="alpha(opacity="+this.degree+")"
	}
	else if (crossobj.style.MozOpacity)
	{
		crossobj.style.MozOpacity=this.degree/101;
	}
	else if (crossobj.style.KhtmlOpacity)
	{
		crossobj.style.KhtmlOpacity=obj.degree/100;
	}
}
 
 
fadeshow.prototype.startit=function()
{
	var crossobj=iebrowser? iebrowser[this.curcanvas] : document.getElementById(this.curcanvas);
	this.populateslide(crossobj, this.curimageindex);
	if (this.pausecheck==1)
	{ //IF SLIDESHOW SHOULD PAUSE ONMOUSEOVER
		var cacheobj=this;
		var crossobjcontainer=iebrowser? iebrowser["master"+this.slideshowid] : document.getElementById("master"+this.slideshowid);
		crossobjcontainer.onmouseover=function(){cacheobj.mouseovercheck=1};
		crossobjcontainer.onmouseout=function(){cacheobj.mouseovercheck=0};
	}
	this.rotateimage();
}


function fill_postimages(obj, theimages)
{
	obj.postimages=new Array(); //preload images
	for (p=0;p<theimages.length;p++)
	{
		obj.postimages[p]=new Image();
		obj.postimages[p].src=theimages[p][0];
	}
}


function switcharray(obj,theimages)
{
	clearInterval(currentfade[obj.slideshowid]); //clear timeout to start fade
	clearInterval(fadeclear[obj.slideshowid]); //clear fading itself

	main_fadeshow.theimages=theimages; //switch image array
	fill_postimages(main_fadeshow, main_fadeshow.theimages); //populate preload images
	main_fadeshow.nextimageindex=0; // reset index

	obj.nextcanvas=(obj.curcanvas==obj.canvasbase+"_0")? obj.canvasbase+"_0" : obj.canvasbase+"_1";
	obj.tempobj=iebrowser? iebrowser[obj.nextcanvas] : document.getElementById(obj.nextcanvas); //  recreate tempobj to prevent jumping back to old image when partly faded
	obj.populateslide(obj.tempobj, obj.nextimageindex); //refill tempobj with new image
	obj.nextimageindex=(obj.nextimageindex<obj.postimages.length-1)? obj.nextimageindex+1 : 0; // recalculate nextimageindex

	fadearray[main_fadeshow.slideshowid].rotateimage();

}