function init(){
  captionH = document.getElementById("galleryPhotoCaption");
  //Hide Caption
  captionH.style.visibility = "hidden";
  //Blank Caption
  captionH.innerHTML = "";
}

function changePhoto(photo, caption){
  photoH = document.getElementById("galleryPhoto");
  captionH = document.getElementById("galleryPhotoCaption");
  //Show/Hide Caption
  if(caption == ""){
    caption = "No caption";
    captionH.style.visibility = "hidden";
  }else{
    captionH.style.visibility = "visible";
  }
  //Set Loading...
  photoH.src = "images/blank.gif";
  //Set photo
  photoH.src = photo;
  //Set Caption
  captionH.innerHTML = caption;
  
  //Stop browser loading photo URL 
  return false;
}