function resize(which, maxsize) {
  var elem = document.getElementById(which);

// if (elem == '' || elem == null) return false;
  
  if (maxsize == '') maxsize = 100;
  if (elem.width > elem.height) {
    if (elem.width > maxsize) elem.width = maxsize;
  } else {
    if (elem.height > maxsize) elem.height = maxsize;
  }
  elem.style.visibility = "visible";
}