// Browser Slide-Show script. With image cross fade effect for those browsers
// that support it.
// Script copyright (C) 2004-2008 www.cryer.co.uk.
// Script is free to use provided this copyright header is included.
		
var FadeDurationMS=2000;
		
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,backgroundID) {
	var foreground=document.getElementById(foregroundID);
	if (foreground.timer) window.clearTimeout(foreground.timer);
	if (backgroundID) {
		var background=document.getElementById(backgroundID);
		if (background) {
			if (background.src) {
				foreground.src = background.src; 
				SetOpacity(foreground,100);
			}
			background.src = newImage;
			background.style.backgroundImage = 'url(' + newImage + ')';
			background.style.backgroundRepeat = 'no-repeat';
			var startMS = (new Date()).getTime();
			foreground.timer = window.setTimeout("ChangeOpacity('" + foregroundID + "'," + FadeDurationMS + "," + startMS + ",100,0)",10);
		}
	} 
	else {
		foreground.src = newImage;
	}
}
			
var slideCache = new Array();

function RunSlideShow(pictureID,backgroundID,imageFiles,displaySecs) {
	var imageSeparator = imageFiles.indexOf(";");
	var nextImage = imageFiles.substring(0,imageSeparator);
	if (slideCache[nextImage] && slideCache[nextImage].loaded) {
		FadeInImage(pictureID,nextImage,backgroundID);
		var futureImages = imageFiles.substring(imageSeparator+1,imageFiles.length)
		+ ';' + nextImage;
		setTimeout("RunSlideShow('"+pictureID+"','"+backgroundID+"','"+futureImages+"',"+displaySecs+")",
		displaySecs*1000);
		// Identify the next image to cache.
		imageSeparator = futureImages.indexOf(";");
		nextImage = futureImages.substring(0,imageSeparator); 
	}
	else {
		setTimeout("RunSlideShow('"+pictureID+"','"+backgroundID+"','"+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;
	}
}