function toggleLayer( whichLayer, swapLayer )
{
	var elem, vis, elem2, vis2;
	if( document.getElementById ) { // this is the way the standards work
	  elem = document.getElementById( whichLayer );
	  elem2 = document.getElementById( swapLayer );
	}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;
	vis2 = elem2.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';
	vis2.display = (vis2.display==''||vis2.display=='block')?'none':'block';
}

function toggleSimple( 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';
}