function selector(Layers) { // Layers -> ARRAY
  for (i = 0; i < Layers.length; i++) {
      if (i == 0) toggleLayer(Layers[i]);
      else hideLayer(Layers[i]);
   }
}

function selectorSH(Layers) { // Layers -> ARRAY
  for (i = 0; i < Layers.length; i++) {
      if (i == 0) showLayer(Layers[i]);
      else hideLayer(Layers[i]);
   }
}


function toggleLayer(whichLayer) {
  if (document.getElementById) {
    // this is the way the standards work
    var style2 = document.getElementById(whichLayer).style;
    style2.display = style2.display? "":"block";
  }
  else if (document.all) {
    // this is the way old msie versions work
    var style2 = document.all[whichLayer].style;
    style2.display = style2.display? "":"block";
  }
  else if (document.layers) {
    // this is the way nn4 works
    var style2 = document.layers[whichLayer].style;
    style2.display = style2.display? "":"block";
  }
}

function hideLayer(whichLayer) {
  if (document.getElementById) {
    // this is the way the standards work
    var style2 = document.getElementById(whichLayer).style;
    style2.display = "";
  }
  else if (document.all) {
    // this is the way old msie versions work
    var style2 = document.all[whichLayer].style;
    style2.display = "";
  }
  else if (document.layers) {
    // this is the way nn4 works
    var style2 = document.layers[whichLayer].style;
    style2.display = "";
  }
}

function showLayer(whichLayer) {
  if (document.getElementById) {
    // this is the way the standards work
    var style2 = document.getElementById(whichLayer).style;
    style2.display = "block";
  }
  else if (document.all) {
    // this is the way old msie versions work
    var style2 = document.all[whichLayer].style;
    style2.display = "block";
  }
  else if (document.layers) {
    // this is the way nn4 works
    var style2 = document.layers[whichLayer].style;
    style2.display = "block";
  }
}