function showPic (whichpic) {
 if (document.getElementById) {
  document.getElementById('placeholder').src = whichpic.href;
	// whichpic.containingdiv.style == hide
	// allbutwhichpic.containingdiv.style == show
  return false;
 } else {
  return true;
 }
}

function showDefaultPic (whichpic) {
 if (document.getElementById) {
  document.getElementById('placeholder').src = whichpic;
	// whichpic.containingdiv.style == hide
	// allbutwhichpic.containingdiv.style == show
  return false;
 } else {
  return true;
 }
}