function showNav(MenuID) {
	if (navigator.appName == "Netscape" && parseInt(navigator.appVersion.charAt(0)) == 4) {
		MenuItem = document.layers[MenuID];
		if (MenuItem.visibility == "hide") { MenuItem.visibility = "show"; }
	}
	else if (document.getElementById) {
		MenuItem = document.getElementById(MenuID);
  if (MenuItem.style.visibility == 'hidden') { MenuItem.style.visibility = 'visible'; }
 }
}

function hideNav(MenuID) {
	if (navigator.appName == "Netscape" && parseInt(navigator.appVersion.charAt(0)) == 4) {
		MenuItem = document.layers[MenuID];
		if (MenuItem.visibility == "show") { MenuItem.visibility = "hide"; }
	}
	else if (document.getElementById) {
		MenuItem = document.getElementById(MenuID);
  if (MenuItem.style.visibility == 'visible') { MenuItem.style.visibility = 'hidden'; }
 }
}

function hideAll() {
	hideNav('menu1');
	hideNav('menu2');
	hideNav('menu3');
}