// 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';
        }