var gblPhotoShufflerDivId = "photodiv";
var gblPhotoShufflerImgId = "photoimg";
var gblImg = new Array(
"2.jpg",
"3.jpg",
"4.jpg",
"5.jpg",
"6.jpg",
"7.jpg",
"8.jpg",
"9.jpg",
"10.jpg",
"11.jpg",
"12.jpg",
"13.jpg",
"14.jpg",
"15.jpg",
"16.jpg",
"17.jpg",
"18.jpg",
"19.jpg",
"20.jpg",
"21.jpg",
"22.jpg",
"23.jpg"
);
var gblPauseSeconds = 2.00;
var gblFadeSeconds = 1.45;
var gblRotations = 100;

var gblDeckSize = gblImg.length;
var gblOpacity = 100;
var gblOnDeck = 0;
var gblStartImg;
var gblImageRotations = gblDeckSize * (gblRotations+1);

window.onload = photoShufflerLaunch;

function photoShufflerLaunch()
{
var theimg = document.getElementById(gblPhotoShufflerImgId);
gblStartImg = theimg.src; // 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);
// copy div background-image to img.src
theimg.src = gblImg[gblOnDeck];
// 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;
}
// 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;
}