You can't, but then you shouldn't need to either.
Your application should be split into a front-end (containing the queries,
forms, reports, macros and modules), linked to a back-end (containing just
the tables). Only the back-end should be on the server: each user should
have his/her own copy of the front-end, preferably on his/her hard drive.
You make the changes in your copy, and then distribute a new copy to all
users.
To help in this process, take a look at the free Auto FE Updater Tony Toews
has at http://www.granite.ab.ca/access/autofe.htm

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Doug Steele, Microsoft Access MVP
http://I.Am/DougSteele
(no e-mails, please!)
> I have just converted an Access97 application to Access2003
>
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> All users have admin rights - do I need to set up the
> security on the database so that only I have admin rights??