select nextval. . .

i am connecting to a postgres 6.4.2 database with msaccess97. in that
postgres database i have a sequence defined. in access i have a form, with
only one textbox -- when i open that form i'd like to populate that textbox
with the next value in that sequence. i can get the next value from psql
(select nextval('sequencename');), but i can't seem to figure out how to
get that nextval from within access97 into a control on a form. i can
design a pass-through query that inserts the nextval into a database, but
that isn't what i want to do (it also exposes some risk of non-uniqueness
that the sequence helps to ensure). got any ideas??

jt