function showCurrentGalleryImage(imageId,imageTitle,imageSig) {
 elem = document.getElementById("displayimage");
 imageURL = "get_sketch.php?id=" + imageId;
 elem.src = imageURL;
 elem = document.getElementById("imagetitle");
 elem.innerHTML = imageTitle;
 elem = document.getElementById("imagesignature");
 elem.innerHTML = imageSig;
}