function newImage(arg) {
 if (document.images) {
  rslt = new Image();
  rslt.src = arg;
  return rslt;
 }
}

function changeImages() {
 if (document.images && (preloadFlag == true)) {
  for (var i=0; i<changeImages.arguments.length; i+=2) {
   document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
  }
 }
}

var preloadFlag = false;
function preloadImages() {
 if (document.images) {
  about_j_r_nelson_over = newImage("images/about-j-r-nelson-over.gif");
  j_r_nelson_landscapes_over = newImage("images/j-r-nelson-landscapes-over.gif");
  j_r_nelson_still_lifes_over = newImage("images/j-r-nelson-still-lifes-over.gif");
  j_r_nelson_collections_over = newImage("images/j-r-nelson-collections-over.gif");
  j_r_nelson_pantry_series_over = newImage("images/j-r-nelson-pantry-over.gif");
  landscape_over = newImage("samples/landscape-impressionist-painting-farmhouse-1a.jpg");
  still_over = newImage("samples/still-life-oil-painting-persimmons.jpg");
  collection_over = newImage("samples/collection-oil-painting-teacups-1a.jpg");
  pantry_series_over = newImage("samples/carrots-and-tomato-juice.jpg");
  larro_over = newImage("images/larro-over.gif");
  rarro_over = newImage("images/rarro-over.gif");
  preloadFlag = true;
 }
}