function photoShufflerLaunch() {
    var theimg = document.getElementById(gblPhotoShufflerImgId);
    gblStartImg = theimg.src; // save away to show as final image
    var theanchor = document.getElementById(gblPhotoShufflerAnchorId);
    gblStartHref = theimg.href; // save away to show as final image

    document.getElementById(gblPhotoShufflerDivId).style.backgroundImage = 'url(' + gblImg[gblOnDeck] + ')';
    setTimeout("photoShufflerFade()", gblPauseSeconds * 1000);
}

function photoShufflerFade()
{
    var theimg = document.getElementById(gblPhotoShufflerImgId);

    // determine delta based on number of fade seconds
    // the slower the fade the more increments needed
    var fadeDelta = 100 / (30 * gblFadeSeconds);

    // fade top out to reveal bottom image
    if (gblOpacity < 2 * fadeDelta) {
        gblOpacity = 100;
        // stop the rotation if we're done
        if (gblImageRotations < 1) return;

        photoShufflerShuffle();
        // pause before next fade
        setTimeout("photoShufflerFade()", gblPauseSeconds * 1000);

    } else {

        gblOpacity -= fadeDelta;
        setOpacity(theimg, gblOpacity);
        setTimeout("photoShufflerFade()", 30);  // 1/30th of a second

    }
}

function photoShufflerShuffle() {
    var thediv = document.getElementById(gblPhotoShufflerDivId);
    var theimg = document.getElementById(gblPhotoShufflerImgId);
    var theanchor = document.getElementById(gblPhotoShufflerAnchorId);

    // copy div background-image to img.src
    theimg.src = gblImg[gblOnDeck];
    theanchor.href = gblHref[gblOnDeck];
    window.status = gblHref[gblOnDeck]; // updates status bar (optional)
    // set img opacity to 100
    setOpacity(theimg, 100);

    // shuffle the deck
    gblOnDeck = ++gblOnDeck % gblDeckSize;
    // decrement rotation counter
    if (--gblImageRotations < 1) {
        // insert start/final image if we're done
        gblImg[gblOnDeck] = gblStartImg;
        gblHref[gblOnDeck] = gblStartHref;
    }

    // slide next image underneath
    thediv.style.backgroundImage = 'url(' + gblImg[gblOnDeck] + ')';
}

function setOpacity(obj, opacity) {
    opacity = (opacity == 100) ? 99.999 : opacity;

    // IE/Win
    obj.style.filter = "alpha(opacity:" + opacity + ")";

    // Safari<1.2, Konqueror
    obj.style.KHTMLOpacity = opacity / 100;

    // Older Mozilla and Firefox
    obj.style.MozOpacity = opacity / 100;

    // Safari 1.2, newer Firefox and Mozilla, CSS3
    obj.style.opacity = opacity / 100;
}