function toggle(whichLayer)
{
  var elem, vis;
  if(document.getElementById)
     elem = document.getElementById( whichLayer );
  else if(document.all) // stupid IE
     elem = document.all[whichLayer];
  else if(document.layers) // and netscape...
     elem = document.layers[whichLayer];
  vis = elem.style;
  if(vis.display==''&&elem.offsetWidth!=undefined&&elem.offsetHeight!=undefined)
     vis.display = (elem.offsetWidth!=0&&elem.offsetHeight!=0)?'block':'none';
  vis.display = (vis.display==''||vis.display=='block')?'none':'block';
}

function hide(d) {
if(d.length < 1) { return; }
document.getElementById(d).style.display = "none";
}

function show(d) {
if(d.length < 1) { return; }
document.getElementById(d).style.display = "block";
}