function showPic(whichpic) {
  var source = whichpic.getAttribute("href");
  var photo = whichpic.getAttribute("title");
  var photolarge = document.getElementById(photo);
  photolarge.setAttribute("src",source);
}

function hidePic(whichpic) {
  var photo = whichpic.getAttribute("title");
  var photolarge = document.getElementById(photo);
  var photosource = photolarge.getAttribute("title");
  photolarge.setAttribute("src",photosource);
}