function toggleAll (whichLayer) {
  var elem, vis;

  if( document.getElementById ) // this is the way the standards work
    elem = document.getElementById( "basic" );
  else if( document.all ) // this is the way old msie versions work
      elem = document.all["basic"];
  else if( document.layers ) // this is the way nn4 works
    elem = document.layers["basic"];
  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 ='none';

  if( document.getElementById ) // this is the way the standards work
    elem = document.getElementById( "complete" );
  else if( document.all ) // this is the way old msie versions work
      elem = document.all["complete"];
  else if( document.layers ) // this is the way nn4 works
    elem = document.layers["complete"];
  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 ='none';

  if( document.getElementById ) // this is the way the standards work
    elem = document.getElementById( "interior" );
  else if( document.all ) // this is the way old msie versions work
      elem = document.all["interior"];
  else if( document.layers ) // this is the way nn4 works
    elem = document.layers["interior"];
  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 ='none';

  if( document.getElementById ) // this is the way the standards work
    elem = document.getElementById( "exterior" );
  else if( document.all ) // this is the way old msie versions work
      elem = document.all["exterior"];
  else if( document.layers ) // this is the way nn4 works
    elem = document.layers["exterior"];
  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 ='none';

  if( document.getElementById ) // this is the way the standards work
    elem = document.getElementById( "engine" );
  else if( document.all ) // this is the way old msie versions work
      elem = document.all["engine"];
  else if( document.layers ) // this is the way nn4 works
    elem = document.layers["engine"];
  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 ='none';

  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';

}