function displaySubMenu(menuid)
{
	document.getElementById(menuid).style.display = "block";
}

function hideSubMenu(menuid)
{
	document.getElementById(menuid).style.display = "none";
}

function hideSubMenus()
{
	document.getElementById('submenu1').style.display = "none";
	document.getElementById('submenu2').style.display = "none";
	document.getElementById('submenu3').style.display = "none";
	document.getElementById('submenu4').style.display = "none";
}