// CSS Photo Shuffler v1.0 by
 //   Carl Camera
 //   http://iamacamera.org 

 var gblPhotoShufflerDivId = "photodiv";
 var gblPhotoShufflerImgId = "photoimg"; 
 var gblImg = new Array(
   "./images/Plate4.jpg",
   "./images/Plate5.jpg",
   "./images/Plate7.jpg",
   "./images/Plate8.jpg",
   "./images/Plate9.jpg",
   "./images/ContactDesignMain.jpg",
   "./images/Plate10.jpg",		
   "./images/Plate11.jpg",
   "./images/Plate12.jpg",
   "./images/Plate13.jpg",
   "./images/ContactDesignMain.jpg",
   "./images/Plate14.jpg",
   "./images/Plate15.jpg",
   "./images/Plate16.jpg",					
   "./images/Plate17.jpg",
   "./images/ContactDesignMain.jpg"
   );
 var gblPauseSeconds = 3;
 var gblFadeSeconds = .85;
 var gblRotations = 10;

 // 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);
       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;
}