//
  // 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 = "toppbilde";
  var gblPhotoShufflerImgId = "photoimg"; 
  var gblImg = new Array(
    "/images/random/random000.jpg",
    "/images/random/random001.jpg",
    "/images/random/random002.jpg",
    "/images/random/random003.jpg",
    "/images/random/random004.jpg",
    "/images/random/random005.jpg",
    "/images/random/random006.jpg",
    "/images/random/random007.jpg"
    );
  var gblPauseSeconds = 6.25;
  var gblFadeSeconds = .85;
  var gblRotations = 999;
 
  // 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;
}