var gblPhotoShufflerDivId = "photodiv";
  var gblPhotoShufflerImgId = "photoimg"; 
  var gblImg = new Array(
  "http://www.derrybros.com/images/ship_1.jpg",
  "http://www.derrybros.com/images/ship_6.jpg", 
    "http://www.derrybros.com/images/truck_2.jpg",
    "http://www.derrybros.com/images/ship_2.jpg",
    "http://www.derrybros.com/images/ship_logos.jpg", 
    "http://www.derrybros.com/images/norfolk.jpg",
    "http://www.derrybros.com/images/tor_line.jpg",
    "http://www.derrybros.com/images/ship_9.jpg",
	"http://www.derrybros.com/images/truck_3.jpg",
	"http://www.derrybros.com/images/ship_10.jpg",
	"http://www.derrybros.com/images/ship_7.jpg",
	"http://www.derrybros.com/images/ship_3.jpg",
	"http://www.derrybros.com/images/truck_4.jpg",
	"http://www.derrybros.com/images/ship_8.jpg",
	"http://www.derrybros.com/images/ship_4.jpg"
    );
  var gblPauseSeconds = 3;
  var gblFadeSeconds = .85;
  var gblRotations = 1000;
 // 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;
}