// 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=1000;
var FadeDurationMS2=50;

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;
  }
}
function FadeInImage2(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 + "'," + FadeDurationMS2 + "," + 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;
  }
}
function RunSlideShow2(pictureID,backgroundID,imageFiles,displaySecs)
{
  var imageSeparator = imageFiles.indexOf(";");
  var nextImage = imageFiles.substring(0,imageSeparator);
  if (slideCache[nextImage] && slideCache[nextImage].loaded)
  {
	FadeInImage2(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;
  }
}