<!--

// This script has been modified from code I found at http://www.netlobo.com/div_hiding.html
// Thanks to netlobo for giving me a headstart :)

var oldLayer;

function toggleLayer( whichLayer )
{
  //make old layer invisible if set
  if(oldLayer)
  oldLayer.display="none";
  
  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';
  
  oldLayer=vis;
  
}
//-->