<!--
function toggleLayer( showLayer, hideLayer )
{
  var elem, vis;
  if( document.getElementById ) // standards
    elem = document.getElementById( showLayer );
  else if( document.all ) // IE
      elem = document.all[whichLayer];
  else if( document.layers ) // Netscape
    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';
  
  var hideElem, vis;
    if( document.getElementById ) // standards
    hideElem = document.getElementById( hideLayer );
  else if( document.all ) // IE
      hideElem = document.all[whichLayer];
  else if( document.layers ) // Netscape
    hideElem = document.layers[whichLayer];
  vis = hideElem.style;
  // if the style.display value is blank we try to figure it out here
  if(vis.display==''&&hideElem.offsetWidth!=undefined&&hideElem.offsetHeight!=undefined)
    vis.display = (hideElem.offsetWidth!=0&&hideElem.offsetHeight!=0)?'block':'none';
  vis.display = (vis.display==''||vis.display=='block')?'none':'block';

}
-->