Erich, I missed this earlier....
If you mean the links at the top of the gallery, I think you'll find you'd change the sizes of all the links. I don't believe we have separate control for just one. I thought you meant the "view map" link under each photo, sorry. If you search through threads, you might find something concerning it, but nothing I can recall. But, I've been wrong before, and I'm a bit spongy at the moment. I'll get back with you after I take a look.
EDIT:
Nope, if you look at the "Class & ID" you'll see all the top links are controlled by the same class. Sorry.