// Browser Slide-Show script. With image cross fade effect for those browsers
// that support it.
// Script copyright (C) 2004-2010 www.cryer.co.uk.
// Script is free to use provided this copyright header is included.
var FadeDurationMS=1000;
function SetOpacity(object,opacityPct)
{
	// IE.
	object.style.filter = 'alpha(opacity=' + opacityPct + ')';
	// Old mozilla and firefox
	object.style.MozOpacity = opacityPct/100;
	// Everything else.
	object.style.opacity = opacityPct/100;
}
function ChangeOpacity(id,msDuration,msStart,fromO,toO)
{
	var element=document.getElementById(id);
	var msNow = (new Date()).getTime();
	var opacity = fromO + (toO - fromO) * (msNow - msStart) / msDuration;
	if (opacity>=100)
	{
		SetOpacity(element,100);
		element.timer = undefined;
	}
	else if (opacity<=0)
	{
		SetOpacity(element,0);
		element.timer = undefined;
	}
	else 
	{
		SetOpacity(element,opacity);
		element.timer = window.setTimeout("ChangeOpacity('" + id + "'," + msDuration + "," + msStart + "," + fromO + "," + toO + ")",10);
	}
}
function FadeInImage(foregroundID,newImage)
{
	var foreground=document.getElementById(foregroundID);
	if (foreground.timer) window.clearTimeout(foreground.timer);
 
	
	foreground.src = newImage;

}
var slideCache = new Array();
function RunSlideShow(pictureID,imageFiles,displaySecs)
{
	var imageSeparator = imageFiles.indexOf(";");
	var nextImage = imageFiles.substring(0,imageSeparator);
	if (slideCache[nextImage] && slideCache[nextImage].loaded)
	{
		FadeInImage(pictureID,nextImage);
		var futureImages = imageFiles.substring(imageSeparator+1,imageFiles.length)
			+ ';' + nextImage;
		setTimeout("RunSlideShow('"+pictureID+"','"+futureImages+"',"+displaySecs+")",
			displaySecs*1000);
		// Identify the next image to cache.
		imageSeparator = futureImages.indexOf(";");
		nextImage = futureImages.substring(0,imageSeparator);
	} else {
		setTimeout("RunSlideShow('"+pictureID+"','"+imageFiles+"',"+displaySecs+")",
			250);
	}
	// Cache the next image to improve performance.
	if (slideCache[nextImage] == null)
	{
		slideCache[nextImage] = new Image;
		slideCache[nextImage].loaded = false;
		slideCache[nextImage].onload = function(){this.loaded=true};
		slideCache[nextImage].src = nextImage;
	}
}