rabideau on "zpSkeleton Album/subAlbum header"

Hello all.

I am trying to figure out where I should add a divider (visual break) after the subAlbum thumbnails 'end'... and where the album thumbnails begin. I'd also like to add some text describing which are actual image thumbs... and which are subAlbum thumbs. I assume the latter goes into the php page. I have used Firefox's Inspect Element tool to no avail.

Here's a sample page:
http://www.many-roads.com/galleries/Cartographic%20Documents/European%20Historical%20Maps

I'd like a horizontal line to appear below the thumbs Historical Poland and The Baltics.

Any ideas or pointers are most appreciated.