// JavaScript Document
  //
  // CSS Photo Shuffler v1.0 by
  //   Carl Camera
  //   http://iamacamera.org 
  //
  // SetOpacity Function and inpiration from Photo Fade by
  //   Richard Rutter
  //   http://clagnut.com
  //
  // License: Creative Commons Attribution 2.5  License
  //   http://creativecommons.org/licenses/by/2.5/
  //

  // Customize your photo shuffle settings

  var gblPhotoShufflerDivId = "photodiv";
  var gblPhotoShufflerImgId = "FeaturePicture"; 
  var gblImg = new Array(
	"images/home/kitchen1.jpg",
	"images/home/kitchen2.jpg",
	"images/home/kitchen3.jpg",
	"images/home/kitchen4.jpg"
    );
  var gblPauseSeconds = 5;
  var gblFadeSeconds = .85;
  var gblRotations = 0;

  var loadingImage = new Image();
  loadingImage.src = "images/home/loading.png"

  // End Customization section
  
  var gblStop = false;
  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()
  {
  	if (gblStop) return;
	
	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;
	  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;

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

function NextImage()
{
	photoShufflerShuffle();
}

function PreviousImage()
{
	gblOnDeck--;
	gblOnDeck--;
	if(gblOnDeck < 0)
		gblOnDeck = gblOnDeck + gblDeckSize;
	photoShufflerShuffle();
}

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;
}

function switchPic(newsrc)
{
	
	gblStop = true;
	
	var featurePic = document.getElementById("FeaturePicture");
	featurePic.src = loadingImage.src;
	
	var newImage = new Image();
	newImage.src = "images/home/" + newsrc + ".jpg";
	
	featurePic.src = newImage.src;
	setOpacity(featurePic,100);
	
}