function toggleLayer( whichLayer )
{
	var elem, vis, count;

	for (count = 0; count <= 10; count++) {
		tag = "tab" + count
		if( document.getElementById ) // this is the way the standards work
			elem = document.getElementById(tag);
		else if( document.all ) // this is the way old msie versions work
			elem = document.all[tag];
		else if( document.layers ) // this is the way nn4 works
			elem = document.layers[tag];
		vis = elem.style;
		if( count == whichLayer ) {
			vis.display = 'block';
		} else {
			vis.display = 'none';
		}
		//vis.display = (vis.display==''||vis.display=='block')?'none':'block';
	}
}
		// 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';