[CentOS] yum pinning rpms

I did a little googling for this, but only found meaningless references, since pin has too, too common other meanings.

Is there a way to pin a version of a particular package with yum/rpm?

I have the rpms for the beta 2.0 version of OpenOffice installed, so I'm not interested in the updates for OpenOffice 1.1.2-24.6.0.EL4 which are now coming in. Is there a way to instruct yum to ignore this update but accept other updates?

Sorry if this is a dumb question, but in spite of many years working with Linux I'm not an rpm/yum heavyweight.

I'm sure, however, others may appreciate the answer.

TIA,