// indexscreen.js

  var gblPhotoShufflerDivId = "slidediv";
  var gblPhotoShufflerImgId = "slideimg"; 
  var gblImg = new Array(
    "./images/slide/index/1.jpg",
	"./images/slide/index/2.jpg",
	"./images/slide/index/3.jpg",
	"./images/slide/index/4.jpg",
	"./images/slide/index/5.jpg",
	"./images/slide/index/6.jpg"
  );
  var gblPauseSeconds = 2.0;
  var gblFadeSeconds = 2.0;
  var gblRefreshRate = 35;
  var gblRotations = 0; // 0 for loop

  // 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*1000/2);
  }

  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 / (gblRefreshRate * gblFadeSeconds);
    
    // fade top out to reveal bottom image
    if (gblOpacity < 2*fadeDelta ) 
    {
      gblOpacity = 100;
      // stop the rotation if we're done
      if (gblImageRotations < 1)
      {
        if (gblRotations == 0) 
        {
           gblImageRotations = gblDeckSize * (gblRotations+1);
           gblOnDeck = 0;
        }
        else
        {
          return;
        }
      }
      photoShufflerShuffle();
      // pause before next fade
      setTimeout("photoShufflerFade()",gblPauseSeconds*1000);
    }
    else
    {
      gblOpacity -= fadeDelta;
      setOpacity(theimg,gblOpacity);
      setTimeout("photoShufflerFade()",gblRefreshRate);
    }
  }

  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)
    {
      if (gblRotations != 0) 
      {
        // 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;
  }