function toggleLayer( whichLayer )
{
  var elem, vis;
  if( document.getElementById ) // this is the way the standards work
    elem = document.getElementById( whichLayer );
  else if( document.all ) // this is the way old msie versions work
      elem = document.all[whichLayer];
  else if( document.layers ) // this is the way nn4 works
    elem = document.layers[whichLayer];
  vis = elem.style;
  // if the style.display value is blank we try to figure it out here
  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 toggleZip() {
  if (document.getElementById("country").value == "") {
    document.getElementById("zip_code_layer").style.display = "none";
    document.getElementById("city_layer").style.display = "none";
  }
  else {
    if (document.getElementById("country").value == "IE") {
      document.getElementById("zip_code_layer").style.display = "none";
      document.getElementById("city_layer").style.display = "inline";
    }
    else {
      document.getElementById("zip_code_layer").style.display = "inline";
      document.getElementById("city_layer").style.display = "none";
    }
  }
}

function show() {}