var images = new Array(
  'home_01.jpg',
  'home_02.jpg',
  'home_03.jpg',
  'home_04.jpg');
var folder = "../images/foto_home/"
var imageWidth = 450;
var imageHeight = 300;
var imageTimeout = 2000;
var nextImage = 1;

function pageLoad() {

  var el = document.getElementById('fading_image_container');
  while (el.firstChild) { el.removeChild(el.firstChild); }

  el.style.width = imageWidth + 'px';
  el.style.height = imageHeight + 'px';

  for(var i=0; i<images.length; i++) {

    var t = document.createElement('IMG');
    t.setAttribute('src',folder+images[i]);
    t.setAttribute('width',imageWidth);
    t.setAttribute('height',imageHeight);
    t.style.position = 'absolute';
    t.style.visibility = 'hidden';
    el.appendChild(t);

  }

  el.firstChild.style.visibility = 'visible';

  window.setTimeout(startFading, imageTimeout);

}


function startFading() {
	var el = document.getElementById('fading_image_container').childNodes[nextImage];

  el.style.visibility = 'visible';
  el.style.zIndex = 2;
  setOpacity(el, 0);
  fadeImage(el,0);

  nextImage = (nextImage < images.length-1) ? nextImage + 1 : 0;

}
function fadeImage(el, currentOpacity) {

  currentOpacity += 5;

  if (currentOpacity > 100) {
    setOpacity(el, 100);
    var prevEl = el.previousSibling ? el.previousSibling : el.parentNode.lastChild;
    prevEl.style.visibility = 'hidden';
    el.style.zIndex = 1;
    window.setTimeout(startFading, imageTimeout);
  }
  else {
    setOpacity(el, currentOpacity);
    window.setTimeout(function() { fadeImage(el, currentOpacity); }, 50);
  }

}
function setOpacity(el, opacity) {

	opacity /= 100;

	el.style.opacity = opacity;
	el.style.MozOpacity = opacity;
	el.style.filter = "alpha(opacity=" + (opacity*100) + ")";

}