2 columns same name cuz of a join

Hi again. :) Does anyone know how to reference a value in an array or object if the returned table has 2 fields of the same name. IE, I am querying 2 tables and returning an id value from each. On both tables, the id fieldname is "id". I know I can access the vals like $array[0] and $array[1], but is there a way I can fetch_object do do that? Can I reference them like $object->table1.id and $object->table2.id? I would assume not since it just makes a new table when it returns the data. Thanks for the help, and I hope my question is clear. :) Jason