var lastPopup = 0;
closeActivePopup = function()
{
	if (lastPopup) {
		lastPopup.style.visibility="hidden";
		lastPopup = 0;
	}
}
popup = function (n)
{
	o = document.getElementById("popup" + n);
	if (lastPopup != o) {
		if (lastPopup) {
			lastPopup.style.visibility = "hidden";
		}
		o.style.visibility = "visible";
	}
	lastPopup = o;
}