function SwapWaldoImage() {
  document.wheres_waldo.src="http://good-ham.smugmug.com/photos/414538668_i6E7J-M.jpg"
}
    
function SwapWaldoImageBack() {
  document.wheres_waldo.src="http://good-ham.smugmug.com/photos/414538654_GABbZ-M.jpg"
}