// JavaScript Document
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';
}