Hi again,
Sorry I don't think you read my message, or it wasn't clear. I did read the link, but I am not using printSearchForm and have a static form hard coded into my pages.
I eventually found the relevant variable in the form was "inalbums". I set this in the hidden variable field and it works great. So if it helps anyone else, setting inalbums to the name of the folder as it appears on disk limits the search to that folder.
If you want to pass the variable in the url it is http://xxxx/zenphoto/index.php?p=search&words=SEARCHWORD&inalbums=ALBUMNAME
It will still be good to set it in one place if possible, perhaps a "default value" can be set somewhere?
All the best,
Phil