var openMenu = null;

function showSubMenu (elemName){
	
	if (openMenu != null){
		openMenu.style.display = "none";
	}
	
	openMenu = document.getElementById(elemName);
	openMenu.style.display = "block";
}

function closeOpenSub (){
	if (openMenu != null){
		openMenu.style.display = "none";
	}
}