function ShowMenu(menuId)
{
	var selectedSubMenu = document.getElementById('subMenu' + menuId);
	
	for (var i = 1; i <= 3; i++)
		if (document.getElementById('subMenu' + i))
			document.getElementById('subMenu' + i).style.display='none';
		
	if (selectedSubMenu)
		selectedSubMenu.style.display='block';
}