/* This script and many more are available free online at
The JavaScript Source :: http://javascript.internet.com
Created by: Justin Barlow :: http://www.netlobo.com
 */

 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';
}