// Jacqueline T. - eXistand GmbH - Robert Naumann

var loadTimer = setInterval("changeImage()",8000);
var imageIndex = 0;
var images = new Array();
var curImage;
var imageId = 'startImage';

function initImage() {
  image = document.getElementById(imageId);
  curImage = image;
  images[0] = new Image(); images[0].src="./fileadmin/images/content/startseite/01.jpg";
  images[1] = new Image(); images[1].src="./fileadmin/images/content/startseite/02.jpg";
  images[2] = new Image(); images[2].src="./fileadmin/images/content/startseite/03.jpg";
  images[3] = new Image(); images[3].src="./fileadmin/images/content/startseite/04.jpg";
  setOpacity(image, 0);
  image.style.visibility = 'visible';
  fadeIn(imageId,0);
}

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;
}

function fadeIn(objId,opacity) {
  if (document.getElementById) {
    obj = document.getElementById(objId);
    if (opacity <= 100) {
      setOpacity(obj, opacity);
      opacity += 1;
      window.setTimeout("fadeIn('"+objId+"',"+opacity+")", 10);
    }
  }
}

function fadeOut(objId,opacity) {
  if (document.getElementById) {
    obj = document.getElementById(objId);
    if (opacity >= 0) {
      setOpacity(obj, opacity);
      opacity -= 1;
      window.setTimeout("fadeOut('"+objId+"',"+opacity+")", 10);
    }
    else {
      nextImage();
    }
  }
}

function changeImage() {
  fadeOut(imageId, 100);
}

function nextImage() {
  if (imageIndex == images.length - 1) {
    imageIndex = -1;
  }
  
  imageIndex += 1;
  curImage.src = images[imageIndex].src;
  fadeIn(imageId, 0);
}