function imgPreload(images, path)
{
  if(document.images) //il browser supporta le immagini?
  {
    for(var i=0;i<images.length;i++)
    {
      var img = new Image();
      img.src = path + images[i];
    }
  }
}

function imgChange(object, newPath, newName)
{
  object.src = newPath + newName;
}