var lastLayerName = "";

function toggle(obj) 
{
	var el = document.getElementById(obj);
	if ( el.style.display != 'none' ) {
		el.style.display = 'none';
	}
	else {
		el.style.display = '';
	}
}

function toggleVisibility(me){
	if (me.style.visibility=="hidden"){
		me.style.visibility="visible";
	}
	else {
		me.style.visibility="hidden";
	}
}

function showLayer(layerName){
	if(layerName != lastLayerName){
		if(document.getElementById){
			var curObj = document.getElementById(layerName);
			if(curObj.innerHTML != ""){
				curObj.style.visibility = "visible";
			}
			if(lastLayerName != ""){
				document.getElementById(lastLayerName).style.visibility = "hidden";
			}
		}
		lastLayerName = layerName;
	}
}

function hideLayer(layerName){
	if(lastLayerName != ""){
		if(document.getElementById){
			document.getElementById(layerName).style.visibility = "hidden";
		}
		lastLayerName = "";
	}
}