var lastOpenMenu = 0;

function openMenu(id)
{	
	if(lastOpenMenu){
		lastOpenMenu.style.visibility = 'hidden'; //zamykam poprzednio otwarte menu
	}
	lastOpenMenu = document.getElementById(id);
	lastOpenMenu.style.visibility = 'visible';
}

function closeMenu()
{
	if(lastOpenMenu) {
		lastOpenMenu.style.visibility = 'hidden';
	}
}

function closeMenuId(id)
{
	openedMenu = document.getElementById(id);
	openedMenu.style.visibility = 'hidden';
}