How can db_owner restore db from backup and keep his permissions?

Hi there
I'm developing an application, and from time to time I take it to
production environment and keep it up to date with dev version. When I
tried to do this alone (istead of sysadmin) I got some error saying
that I didn't have enough permissions to do restore (despite I was a
db_owner).
Is it possible, that the reason for that is the fact that in dev
version which I was restoring there was no user which had db_owner
permissions? so, I was working on this database as some user with
db_owner permissions and restored it to the state in which there wasn't
any user mapped to my login in db anymore.
Is it possible? If so, then how can I restore db as a db_owner?
thanks a lot
HP
From BOL:
"If the database being restored does not exist, the user must have CREATE
DATABASE permissions to be able to execute RESTORE. If the database exists,
RESTORE permissions default to members of the sysadmin and dbcreator fixed
server roles and the owner (dbo) of the database (for the FROM
DATABASE_SNAPSHOT option, the database always exists)."
Cheers,
Paul Ibison SQL Server MVP, www.replicationanswers.com .