//
// 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
//
// * Surround the target < img /> with a < div >. specify id= in both
// * The first and final photo displayed is in the html <img> tag
// * The array contains paths to photos you want in the rotation.
//   If you want the first photo in the rotation, then it's best to
//   put it as the final array image.  All photos must be same dimension
// * The rotations variable specifies how many times to repeat array.
//   images. zero is a valid rotation value.

var gblPhotoShufflerDivId = "imagediv0001";
var gblPhotoShufflerImgId = "image0001";
var gblImg =
[
	"/local/rokmpg.com/images/slider/Slide02.jpg",
	"/local/rokmpg.com/images/slider/Slide01.jpg"
];
var gblPauseSeconds = 7.25;
var gblFadeSeconds = .85;
var gblRotations = 10000;

// End Customization section
var gblDeckSize = gblImg.length;
var gblOpacity = 100;
var gblOnDeck = 0;
var gblStartImg;
var gblImageRotations = gblDeckSize * (gblRotations+1);
// window.onload = photoShufflerLaunch;
for(var i = 0; i < gblImg.length; i++)
{
	var objImg = new Image();
	objImg.src = gblImg[i];
}

function photoShufflerLaunch()
{
	var theimg = document.getElementById(gblPhotoShufflerImgId);
	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;
}