<!-- 
function toggleLayer(whichLayer)
{
if (document.getElementById)
  {
  // standard
  var style2 = document.getElementById(whichLayer).style;
  style2.display = style2.display? "":"block";
  }
else if  (document.all)
  {
  // msie
   var style2 = document.all[whichLayer].style;
  style2.display = style2.display? "":"block";
  }
else if (document.layers)
  {
  // nn4
   var style2 = document.layers[whichLayer].style;
  style2.display = style2.display? "":"block";
  }
}
-->