public static function GetPersisted($fieldname, $default = "",$escape = false)
	{
		if ( isset($_REQUEST[$fieldname]) )
		{
			$_SESSION["_PERSISTED_".$fieldname] = self::Get($fieldname, $default, $escape);
		}

		if ( !isset($_SESSION["_PERSISTED_".$fieldname]) )
		{
			$_SESSION["_PERSISTED_".$fieldname] = $default;
		}

		return $_SESSION["_PERSISTED_".$fieldname];
	}