var dom = document.getElementById ? true:false;
var nn4 = document.layers ? true:false;
var ie4 = document.all ? true:false;

var buttonHeight = 30;
var numberMenus = 7;
var openMenu = 0;
var closeTimer;

function getLayer(name) {
	var layer;
	if (ie4) layer = document.all[name].style; 
	if (nn4) layer = eval('document.layers["' + name + '"]');
	if (dom) layer = document.getElementById(name).style;
	return layer;
}
	
function hideMenu(menuID) {
	if (!nn4)
	{
		var layer = getLayer("menu" + menuID);
		layer.visibility = "hidden";
		openMenu = 0;
	}
}

function hideAll() {
	for (i = 1; i <= numberMenus; i++)
		hideMenu(i);
}

function showMenu(menuID) {
	if (!nn4)
	{
		clearTimeout(self.closeTimer);
		if (menuID != 7)
		{
			for (i = 1; i <= numberMenus; i++) 
				hideMenu(i);
		}
		var layer = getLayer("menu" + menuID);
		layer.visibility = "visible";
		openMenu = menuID;
	}
}

function mouseOn() {
//	menuItem.style.backgroundColor = "#99FFFF";
	clearTimeout(self.closeTimer);
}
	
function startCloseTimer() {
		self.closeTimer = setTimeout("hideAll();", 50);
}

function mouseOff() {
//	menuItem.style.backgroundColor = "#FFFFFF";
	startCloseTimer();
}