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

function showLayer(layerName){
	document.getElementById(layerName).style.visibility="visible";
}

function openWin(url, title, w, h){
	window.open(url, title, "width=" + w + ",height=" + h + ",left=150,top=145,menubar=no,directories=no,toolbar=no,location=no,status=no,scrollbars=yes,resizable=yes");
}