Right to create temp tables

Hello,

I need to access the database through PHP on an Apache server.
The connections are done with the user "nobody", which I created
in PostgreSQL (version 6.5.3)

It works fine for select, however I'd need to create temporary tables,
and execute insert / update on them with that user. The documentation
about the grant command seems to apply only to existing objects.

Any idea ?

Thanks,
Alain