[ADMIN] cannot grant access to user "nobody"

Hi there,

I'using Postgres 6.2.3. I'd like to access my database from the web
using PHP.

I need to grant access (select) to user "nobody" ,using
grant select on table to nobody
but the action failed with error message:
"aclparse : bad keyword , must be [group|user]"

I 've created user nobody with creatuser.

Is "nobody" a keyword in postgres?
nobody is the httpd user's.How can I specify a different user to
access postgres database?

Thanks

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