//var gblPhotoShufflerDivId = "photodiv";
//var gblPhotoShufflerImgId = "photoimg"; 
var gblPhotoShufflerDivId = "slidShow";
var gblPhotoShufflerImgId = "photoimg"; 
var gblImg = new Array(
		"./img/slidshow/2.jpg",
		"./img/slidshow/3.jpg",
		"./img/slidshow/4.jpg",
		"./img/slidshow/5.jpg",
		"./img/slidshow/1.jpg",
		"./img/slidshow/2.jpg",
		"./img/slidshow/3.jpg",
		"./img/slidshow/4.jpg",
		"./img/slidshow/5.jpg",
		"./img/slidshow/1.jpg"
	);
var gblPauseSeconds = 5;
var gblFadeSeconds = .85;
var gblRotations = 100;

// End Customization section

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);
	
	// start?
	if (!theimg) {
		return;
	}
	
    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;
}