function switchDiv(whichLayer,on) {
  var el = document.getElementById(whichLayer);
  if (!el) return;

  var el2 = document.getElementById(whichLayer+"_iframe");

  if (on > 0) {
    el.style.display = '';
    if (el2) el2.style.display = '';
  } else {
    el.style.display = 'none';
    if (el2) el2.style.display = 'none';
  }
}

function switchRow(whichLayer) {
  var imgLayer = whichLayer+"_img";
  var element = document.getElementById(whichLayer);
  var img = document.getElementById(imgLayer);

  element.style.display = element.style.display?"":"none";
  var url = img.src;
  var path = url.substring(0,url.indexOf("arrow"));
  var file = url.substring(url.indexOf("arrow"));
  if (file == "arrow01.gif") file = "arrow02.gif";
  else file = "arrow01.gif";
  
  img.src = path + file;
}