function hideLayer(whichLayer) {
 if (document.getElementById) {
  var style2 = document.getElementById(whichLayer).style;
  style2.display = "none";
 } else if (document.all) {
  var style2 = document.all[whichLayer].style;
  style2.display = "none";
 } else if (document.layers) {
  var style2 = document.layers[whichLayer].style;
  style2.display = "none";
 }
}

function showLayer(whichLayer){
 if (document.getElementById) {
  var style2 = document.getElementById(whichLayer).style;
  style2.display = "";
 } else if (document.all) {
  var style2 = document.all[whichLayer].style;
  style2.display = "";
 } else if (document.layers) {
  var style2 = document.layers[whichLayer].style;
  style2.display = "";
 }
}

function toggleLayer(whichLayer)
{
 if (document.getElementById) {
  var style2 = document.getElementById(whichLayer).style;
  if (style2.display == "" || style2.display == "") 
    { style2.display = "none";} else {style2.display = "";}
 } else if (document.all) {
  var style2 = document.all[whichLayer].style;
  if (style2.display == "" || style2.display == "") 
    { style2.display = "none";} else {style2.display = "";}
 } else if (document.layers) {
  var style2 = document.layers[whichLayer].style;
  if (style2.display == "" || style2.display == "") 
    { style2.display = "none";} else {style2.display = "";}
 }
}