//
  // 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 = "shufflediv";
  var gblPhotoShufflerImgId = "photoshuffle"; 
  // var gblImg = new Array(
  //    "/images/top_photo1.jpg",
  //    "/images/top_photo2.jpg",
  //    "/images/top_photo3.jpg",
  // 	  "/images/top_photo4.jpg",
	//    "/images/top_photo5.jpg",
	//    "/images/top_photo6.jpg",
	//    "/images/top_photo7.jpg",
	//    "/images/top_photo8.jpg",
	//    "/images/top_photo9.jpg");
	//
	//   on August 5, 2009 the photos above were replaced with the images below
	//   Steve Feher
	//
//	 var gblImg = new Array(
//      "/images/home/top_photo_01.jpg",
//      "/images/home/top_photo_02.jpg",
//      "/images/home/top_photo_03.jpg",
//  	  "/images/home/top_photo_04.jpg",
//	    "/images/home/top_photo_05.jpg",
//	    "/images/home/top_photo_06.jpg",
//	    "/images/home/top_photo_07.jpg",
//	    "/images/home/top_photo_08.jpg",
//	    "/images/home/top_photo_09.jpg",
//	    "/images/home/top_photo_10.jpg",
//	    "/images/home/top_photo_11.jpg",
//	    "/images/home/top_photo_12.jpg");
//
// Replaced by CGM July 28, 2010
	 
	 var gblImg = new Array(
      "/images/DF for Web/SHIFT_2010_1.jpg",
      "/images/DF for Web/SHIFT_2010_2.jpg",
      "/images/DF for Web/SHIFT_2010_3.jpg",
  	  "/images/DF for Web/SHIFT_2010_4.jpg",
	  "/images/DF for Web/SHIFT_2010_5.jpg",
	  "/images/DF for Web/SHIFT_2010_6.jpg",
	  "/images/DF for Web/SHIFT_2010_7.jpg",
	  "/images/DF for Web/SHIFT_2010_8.jpg",
	  "/images/DF for Web/SHIFT_2010_NM.jpg",
	  "/images/DF for Web/SHIFT_2010_UT.jpg",
	  "/images/DF for Web/SHIFT_2010_WY.jpg",
	  "/images/DF for Web/SHIFT_CO_2010.jpg");
	        
  var gblPauseSeconds = 4.25;
  var gblFadeSeconds = .85;
  var gblRotations = 50;

  // 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;
}