function spaizGetElementById(id) {
if (document.getElementById(id)) {
	return document.getElementById(id);
	} else if (document.all[id]) {
		return document.all[id];
		} else if (document.layers && document.layers[id]) {
			return (document.layers[id]);
			} else {
				return false;
			}
}
function toggle_visibility(id, flag)  {
if (spaizGetElementById(id)) {
	spaizGetElementById(id).style.visibility = (flag) ? 'visible' : 'hidden';
	}
}