Adding flexibilty to queries

Hi all,

I have a question regarding psql.  As I am more familiar with oracle I
can write the following select and make it rather flexible:
select name
from name_table
where person_id = &id;
The &id portion is what I am looking for in PostgreSQL.  Basically when
running this query, the person running the query is prompted to supply a
value.  What is the equivalent in postgres?

TIA,
-- 
Alan Carbutt
Systems Administrator/Programmer
Adams State College
719-587-7741
arcarbut@adams.edu