function switchMenus(parentMenuID, subMenuID)
{
	var d = document.getElementById(subMenuID);
	for (var i = 1; i<=30; i++)
	{
		if (document.getElementById('submenu_' + i))
		{
			document.getElementById('submenu_'+i).style.display = 'none';
		}
	}
	for (var i = 1; i<=30; i++)
	{
		if (document.getElementById('menu_' + i))
		{
			if (i % 2 == 1)
				document.getElementById('menu_'+i).className='';
			else
				document.getElementById('menu_'+i).className='even_menu_option';}
		}
	if (d)
	{
		d.style.display='block';
	}

	var parentMenu = document.getElementById(parentMenuID);
	if (parentMenu != undefined)
	{
		parentMenu.className = 'selected_menu';
	}
}

var url = "/select_menu.php?menuID=";
var newUrl = '';

function handleMenuHttpResponse()
{
  if (http.readyState == 4)
  {
  	var result = http.responseText;
  	isWorking = false;
	if (newUrl != undefined && newUrl != '')
	{
		document.location = newUrl;
	}
  }
}

var isWorking = false;

function updateMenu(menuID, _newUrl)
{
	newUrl = _newUrl;
	if (!isWorking && http)
	{
		http.open("GET", url + menuID, true);
		http.onreadystatechange = handleMenuHttpResponse;
		isWorking = true;
		http.send(null);
	}
}