function showPic(whichpic) {
  var source = whichpic.getAttribute("href");
  var placeholder = document.getElementById("placeholder");
  placeholder.setAttribute("src",source);
  var text = whichpic.getAttribute("title");
  var description = document.getElementById("description");
  description.firstChild.nodeValue = text;
}

function showPic2(whichpic) {
  var source = whichpic.getAttribute("href");
  var placeholder = document.getElementById("placeholder2");
  placeholder.setAttribute("src",source);
  var text = whichpic.getAttribute("title");
  var description = document.getElementById("description2");
  description.firstChild.nodeValue = text;
}

function showPic3(whichpic) {
  var source = whichpic.getAttribute("href");
  var placeholder = document.getElementById("placeholder3");
  placeholder.setAttribute("src",source);
  var text = whichpic.getAttribute("title");
  var description = document.getElementById("description3");
  description.firstChild.nodeValue = text;
}

function showPic4(whichpic) {
  var source = whichpic.getAttribute("href");
  var placeholder = document.getElementById("placeholder4");
  placeholder.setAttribute("src",source);
  var text = whichpic.getAttribute("title");
  var description = document.getElementById("description4");
  description.firstChild.nodeValue = text;
}