function getElement(id) {
	if(document.all) {
		return document.all[id];
	} else if (document.getElementById)
	{
		return document.getElementById(id);
	}
}

var oldID;
function displaySubMenu(id)
{
	if (id == oldID)
		return;

    var newSubMenu =  getElement('submenu' + id);
    var newMenu = getElement('menu' + id);
	
	var oldSubMenu;
	var oldMenu;

	if (oldID)
	{
		oldSubMenu = getElement('submenu' + oldID);
		oldMenu = getElement('menu' + oldID);
	}
	
	if (newSubMenu)
	{
		newSubMenu.className = 'displaySubMenu'; 
		
		if (oldSubMenu)
			oldSubMenu.className = 'hiddenSubMenu';
			
		oldSubMenu = newSubMenu;		
	}
	
	if (newMenu)
	{
		newMenu.className = 'tabnavactive'; 
		
		if (oldMenu)
		{
			oldMenu.className = '';
		}	
		oldMenu = newMenu;	
	}
	
	oldID = id;
}