var curEl = 0;
var fadeInterval = 4500;
var numImages = 0;
var imagesLoaded = 0;
var containerId = 'slideshow';


function initFade(images) {
	var container = document.getElementById(containerId);
	
	//var images = container.getElementsByTagName("img");
	
     

     // set image list
     /*var images = new Array();
     images[0] = "/image/start/slideshow/slide1.jpg";
	 images[1]="/image/start/slideshow/slide2.jpg";
	 images[2]="/image/start/slideshow/slide3.jpg";
	  images[5]="/image/start/headpic/6.jpg";
	 images[6]="/image/start/headpic/7.jpg";
	 images[7]="/image/start/headpic/8.jpg";*/
	
	numImages = images.length;
	
	 // create object
     	var imageObj = null;
     	var imageHolder = null
     // start preloading
     for(var i = 0; i< numImages; i++) 
     {
		 imageHolder = document.createElement('div');
		 imageHolder.className = 'fadeImages';
		 
    	 imageObj = new Image();
          imageObj.src=images[i];
		  imageObj.onLoad = imageLoaded();
		  imageObj.id = 'el'+i;
		  
		  imageObj.style.opacity = 0;
		  imageObj.style.filter = 'alpha(opacity = \'0\')';
    	  imageObj.FadeState = imageObj.FadeState == 1 ? 2 : -2;
		
    	  imageHolder.appendChild(imageObj);
		  container.appendChild(imageHolder);
		  imageObj = null;
		  imageHolder = null;
     }
	 
	
	/*var element = null;
	for (var i = 0; i < numImages; i++) {
		element = images[i];
		element.style.opacity = 0;
		element.style.filter = 'alpha(opacity = '
        + (element.FadeState == 1 ? '85' : '0') + ')';
    	element.FadeState = element.FadeState == 1 ? 2 : -2;
	}*/
}

     /* <img id="el0" class="fadeImages" src="/image/start/headpic/1.jpg" />
      <img id="el1" class="fadeImages" src="/image/start/headpic/2.jpg" />
      <img id="el2" class="fadeImages" src="/image/start/headpic/3.jpg" />
      <img id="el3" class="fadeImages" src="/image/start/headpic/4.jpg" />
      <img id="el4" class="fadeImages" src="/image/start/headpic/5.jpg" />
      <img id="el5" class="fadeImages" src="/image/start/headpic/6.jpg" />
      <img id="el6" class="fadeImages" src="/image/start/headpic/7.jpg" />
      <img id="el7" class="fadeImages" src="/image/start/headpic/8.jpg" />*/
	  
function imageLoaded() {
	imagesLoaded++;
	//alert('loaded ' + imagesLoaded + " / " + numImages)
	
	if (imagesLoaded == numImages) {
		//alert('start')
		var container = document.getElementById(containerId);
		container.style.display = 'block';
		fade('el'+curEl);
		//fade(curEl);
		nextFade();
	}
}

function nextFade() {
	//curEl = (curEl+1) % numImages;
	setTimeout("fadeInOut()", fadeInterval);
}
function fadeInOut() {
	//alert('remove' + curEl);
	fade('el'+curEl); //ta bort
	
	curEl++;
	curEl = curEl % numImages;
	//alert('add' + curEl);
	fade('el'+curEl); //lägg till
	
	nextFade();
}


var TimeToFade = 1000.0;
var maxOpac = '1'; //0.8
var minOpac = '0';

function fade(eid)
{
	//alert(eid)
  var element = document.getElementById(eid);
  if(element == null)
    return;
   
  if(element.FadeState == null)
  {
    if(element.style.opacity == null
        || element.style.opacity == minOpac
        || element.style.opacity == maxOpac)
    {
      element.FadeState = -2;
    }
    else
    {
      element.FadeState = 2;
    }
  }
   
  if(element.FadeState == 1 || element.FadeState == -1)
  {
    element.FadeState = element.FadeState == 1 ? -1 : 1;
    element.FadeTimeLeft = TimeToFade - element.FadeTimeLeft;
  }
  else
  {
    element.FadeState = element.FadeState == 2 ? -1 : 1;
    element.FadeTimeLeft = TimeToFade;
   // element.style.display = element.FadeState == 2 ? 'none' : 'block';
    setTimeout("animateFade(" + new Date().getTime()
        + ",'" + eid + "')", 33);
  }
}

function animateFade(lastTick, eid)
{
  var curTick = new Date().getTime();
  var elapsedTicks = curTick - lastTick;
 
  var element = document.getElementById(eid);
 
  if(element.FadeTimeLeft <= elapsedTicks)
  {
   //element.style.display = element.FadeState == 1 ? 'block' : 'none';
    
	element.style.opacity = element.FadeState == 1
        ? maxOpac : minOpac;//.85
    element.style.filter = 'alpha(opacity = '
        + (element.FadeState == 1 ? '85' : '0') + ')';
    element.FadeState = element.FadeState == 1 ? 2 : -2;
    return;
  }
 
  element.FadeTimeLeft -= elapsedTicks;
  var newOpVal = element.FadeTimeLeft/TimeToFade;
  if(element.FadeState == 1)
    newOpVal = 1 - newOpVal;

  newOpVal = newOpVal*maxOpac;//0.85;
  element.style.opacity = newOpVal;
  element.style.filter =
      'alpha(opacity = ' + (newOpVal*100) + ')';
 
  setTimeout("animateFade(" + curTick
      + ",'" + eid + "')", 33);
}