nMenuLayer = 0;

function toggleSubMenu(menuName, displayName)
{
	ctrl = document.getElementById(menuName);
	if(ctrl == null)
		return;
	
	ctrl.style.display = displayName;	
}

function scrollMenu(sMenuName)
{
	ctrl = document.getElementById(sMenuName + (nMenuLayer>0?nMenuLayer:""));
	if(ctrl != null)
		ctrl.style.display = 'none';
	nMenuLayer++;
	ctrl = document.getElementById(sMenuName + nMenuLayer);
	if(ctrl != null)
		ctrl.style.display = 'block';
	else
	{
		nMenuLayer = 0;
		ctrl = document.getElementById(sMenuName);
		if(ctrl != null)
			ctrl.style.display = 'block';
	}	
}