//global objects
var xfade = {'clock' : null, 'count' : 1}
xfade.images = arrImages;

//cache the images
xfade.cache = [];
for(var i=0; i<xfade.images.length; i++)
{
	xfade.cache[i] = new Image;
	xfade.cache[i].src = xfade.images[i];
}

function swapImage()
{
	if (xfade.clock == null)
	{
		xfade.image = arguments[0];
		xfade.src = arguments[1];
		if (typeof xfade.image.style.opacity != 'undefined') {xfade.type = 'w3c';}
		else if (typeof xfade.image.style.MozOpacity != 'undefined') {xfade.type = 'moz';}
		else if (typeof xfade.image.style.KhtmlOpacity != 'undefined') {xfade.type = 'khtml';}
		else if (typeof xfade.image.filters == 'object') {xfade.type = (xfade.image.filters.length > 0 && typeof xfade.image.filters.alpha == 'object' && typeof xfade.image.filters.alpha.opacity == 'number') ? 'ie' : 'none';}
		else {xfade.type = 'none';}

		if (typeof arguments[3] != 'undefined' && arguments[3] != '') {xfade.image.alt = arguments[3];}
		
		if (xfade.type != 'none')
		{
			xfade.imageNew = document.getElementsByTagName('body')[0].appendChild((typeof document.createElementNS != 'undefined') ? document.createElementNS('http://www.w3.org/1999/xhtml', 'img') : document.createElement('img'));
			xfade.imageNew.className = 'idupe';
			xfade.imageNew.src = xfade.src
			xfade.imageNew.style.left = xfade.getPosition(xfade.image, 'x') + 'px';
			xfade.imageNew.style.top = xfade.getPosition(xfade.image, 'y') + 'px';
			xfade.length = parseInt(arguments[2], 10) * 1000;
			xfade.resolution = parseInt(arguments[2], 10) * 20;
			xfade.clock = setInterval('xfade.swapImage()', xfade.length/xfade.resolution);
		}
		
		else {xfade.image.src = xfade.src;}
	}
}


xfade.swapImage = function()
{
	xfade.count -= (1 / xfade.resolution);
	if (xfade.count < (1 / xfade.resolution))
	{
		clearInterval(xfade.clock);
		xfade.clock = null;
		xfade.count = 1;
		xfade.image.src = xfade.src;
	}
	
	switch (xfade.type)
	{
		case 'ie' :
			xfade.image.filters.alpha.opacity = xfade.count * 100;
			xfade.imageNew.filters.alpha.opacity = (1 - xfade.count) * 100;
			break;
			
		case 'khtml' :
			xfade.image.style.KhtmlOpacity = xfade.count;
			xfade.imageNew.style.KhtmlOpacity = (1 - xfade.count);
			break;
			
		case 'moz' : 
			xfade.image.style.MozOpacity = (xfade.count == 1 ? 0.9999999 : xfade.count);
			xfade.imageNew.style.MozOpacity = (1 - xfade.count);
			break;
			
		default : 
			xfade.image.style.opacity = (xfade.count == 1 ? 0.9999999 : xfade.count);
			xfade.imageNew.style.opacity = (1 - xfade.count);
	}
	
	xfade.imageNew.style.visibility = 'visible';
	xfade.imageNew.style.left = xfade.getPosition(xfade.image, 'x') + 'px';
	xfade.imageNew.style.top = xfade.getPosition(xfade.image, 'y') + 'px';
	if (xfade.count == 1) {xfade.imageNew.parentNode.removeChild(xfade.imageNew);}
}

xfade.getPosition = function()
{
	this.pos = (arguments[1] == 'x') ? arguments[0].offsetLeft : arguments[0].offsetTop;
	this.tmp = arguments[0].offsetParent;
	while (this.tmp != null)
	{
		this.pos += (arguments[1] == 'x') ? this.tmp.offsetLeft : this.tmp.offsetTop;
		this.tmp = this.tmp.offsetParent;
	}
	
	return this.pos;
}