I am making a artist site and am creating a dynamic CV views page.

It takes most of its fields from a content type called exhibitions. In the exhibition page there is an address field and a node-referenced field called gallery. The gallery content type page also has an address field. In the exhibition address input box it is stated that you should insert an address only if it differs from the gallery address (If the Gallery has arranged an exhibition somewhere else).

I want to check if the exhibition address field has been filled out, and if not i want to input the gallery address instead.

Is it a php defined argument I will have to make?

I have only recently started using Drupal (about a week) and everything has been working fine. Most of my problems has been to use data from other db-tables. Any help, either pointing me to some documentary page or other will be greatly appreciated.

Jakob