Either replace the jr_users_online smarty function with paMaxOnline, or use paMaxOnline as a call in its own right.
Addition variables returned when using paMaxOnline are $MAX_ARTISTS_ONLINE, $MAX_ARTISTS_TIME, $MAX_MEMBERS_ONLINE, $MAX_MEMBERS_TIME, $MAX_VISITORS_ONLINE, $MAX_VISITORS_TIME, $MAX_USERS_ONLINE, $MAX_USERS_TIME, $MAX_TOTAL_ONLINE and $MAX_TOTAL_TIME.
The 'TIME' variables are in unixtime format - use the jr_date_format modifier with them to format the output