var timeout	= 500;
var TimerTest	= 0;
var MenuTest	= 0;

// open hidden layer
function MenuOpen(id){	
	// cancel close timer
	MenuCancelCloseTime();

	// close old layer
	if(MenuTest) MenuTest.style.visibility = 'hidden';

	// get new layer and show it
	MenuTest = document.getElementById(id);
	MenuTest.style.visibility = 'visible';

}
// close showed layer
function MenuClose(){
	if(MenuTest) MenuTest.style.visibility = 'hidden';
}

// go close timer
function MenuCloseTime(){
	TimerTest = window.setTimeout(MenuClose, timeout);
	return true;
}

// cancel close timer
function MenuCancelCloseTime(){
	if(TimerTest)
	{
		window.clearTimeout(TimerTest);
		TimerTest = null;
	}
	return true;
}

// close layer when click-out
// document.onclick = MenuClose;