function ToggleLayerDisplay(LayerId)
{  
	var elem, vis;  
	
	if (document.getElementById) { 						// this is the way the standards work    
		elem = document.getElementById(LayerId);  
	} else if( document.all ) {							// this is the way old msie versions work      
		elem = document.all[LayerId];  
	} else if(document.layers) {						// this is the way nn4 works    
		elem = document.layers[LayerId]; 
	} 
		
	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';
}