// JScript File

function toggleLayer( whichLayer )
{  
  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';
}