function imageNext() {
  var i = -1;
  var index = 0;
  while(i <= galleryItems.length){
    i++;
    if(galleryItems[i] == actualPhoto){
      index = i;
      break;
    }
  }
  if((index+1) < galleryItems.length){
    document['top-photo'].src = galleryItems[index+1];
    actualPhoto = galleryItems[index+1];
  }
  else {
    document['top-photo'].src = galleryItems[0];
    actualPhoto = galleryItems[0];
  }
}

function imagePrevious() {
  var i = -1;
  var index = 0;
  while(i <= galleryItems.length){
    i++;
    if(galleryItems[i] == actualPhoto){
      index = i;
      break;
    }
  }
  if((index-1) >= 0){
    document['top-photo'].src = galleryItems[index-1];
    actualPhoto = galleryItems[index-1];
  }
  else {
    document['top-photo'].src = galleryItems[galleryItems.length-1];
    actualPhoto = galleryItems[galleryItems.length-1];
  }
}

function change(path) {
  document['top-photo'].src = path;
  actualPhoto = path;

}

function thumbToImage(thumb) {
  var  s = thumb;
  var a = s.indexOf('/Thumbnail/');
  var s1 = s.substring(0,a+1);
  var s2 = s.substring(a+14,s.length);
  s = s1+'Image/'+s2;
  return s;
}