// 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;
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);
    FadeInImage(pictureID,nextImage,backgroundID);
    var futureImages = imageFiles.substring(imageSeparator+1,imageFiles.length)+ ';' + nextImage;
    setTimeout("RunSlideShow('"+pictureID+"','"+backgroundID+"','"+futureImages+"',"+displaySecs+")",displaySecs*1000);
    // Cache the next image to improve performance.
    imageSeparator = futureImages.indexOf(";");
    nextImage = futureImages.substring(0,imageSeparator);
    if (slideCache[nextImage] == null)
    {
        slideCache[nextImage] = new Image;
        slideCache[nextImage].src = nextImage;
    }
}