// JavaScript Document

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);
	var fadeDelta = 100 / (30 * gblFadeSeconds);

  if (gblOpacity < 2*fadeDelta ) 
  {
    gblOpacity = 100;
    if (gblImageRotations < 1) return;

    photoShufflerShuffle();
    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);

  theimg.src = gblImg[gblOnDeck];
  setOpacity(theimg,100);

  gblOnDeck = ++gblOnDeck % gblDeckSize;
  if (--gblImageRotations < 1)
    gblImg[gblOnDeck] = gblStartImg;

  thediv.style.backgroundImage='url(' + gblImg[gblOnDeck] + ')';
}


function setOpacity(obj, opacity) {
  opacity = (opacity == 100)?99.999:opacity;
  obj.style.filter = "alpha(opacity:"+opacity+")";
  obj.style.KHTMLOpacity = opacity/100;
  obj.style.MozOpacity = opacity/100;
  obj.style.opacity = opacity/100;
}