function show(n)
{
	var el;
	if (el = document.getElementById(n)) {
		el.style.display = "block";
		el.style.visibility = "visible";
	}
}
function hide(n)
{
	var el;
	if (el = document.getElementById(n)) {
		el.style.display = "none";
		el.style.visibility = "hidden";
	}
}