function swapLayers(lnk,id) {
//doLinkClass(lnk);
var lyr = getElemRefs(id);
if (lyr.css.display == "block") { hideLayer(id); lnk.className = "off"; } else { showLayer(id);  lnk.className = "opened";}
}

function showLayer(id) {
  var lyr = getElemRefs(id);
  if (lyr && lyr.css) lyr.css.display = "block";
}

function hideLayer(id) {
  var lyr = getElemRefs(id);
  if (lyr && lyr.css) lyr.css.display = "none";
}

function getElemRefs(id) {
	var el = (document.getElementById)? document.getElementById(id): (document.all)? document.all[id]: (document.layers)? getLyrRef(id,document): null;
	if (el) el.css = (el.style)? el.style: el;
	return el;
}