// http://www.rob-watson.co.uk/
var images = new Array(
  '/img/pizza/chicken_parmesan_spinach_homepage.jpg',
  '/img/pizza/advantage1_pizza_image.jpg',
  '/img/pizza/pizza_2.jpg',
  '/img/pizza/pizza_3.jpg',
  '/img/pizza/antipesto.jpg'
  );
var nextImage = 1;
var imageWidth = 900;
var imageHeight = 350;
var imageTimeout = 3000;

function setOpacity(el, opacity) {
  //  Which opacity method does this browser support?
  opacity /= 100;
  el.style.opacity = opacity;
  el.style.MozOpacity = opacity;
  el.style.filter = "alpha(opacity=" + (opacity*100) + ")";
}

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 startFading() {
  var el = document.getElementById('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 pageLoad() {
  var el = document.getElementById('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('alt', 'Bravo Pizza in Atascadero');
    t.setAttribute('title', 'Bravo Pizza in Atascadero');
    t.setAttribute('src',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);
}