return DataObject::get("ImageGalleryAlbum", "ImageGalleryPageID > 0", "Created DESC", $num);

if I understood you correctly, this is what my function now looks like:

        function LatestAlbums($num=4) {
        return DataObject::get("ImageGalleryAlbum", "ImageGalleryPageID > 0", "Created DESC", $num);
        }

this still returns an error..

Thank you so much UncleCheese, this works now after adding an empty parameter before $num.

        function LatestAlbums($num=4) {
        return DataObject::get("ImageGalleryAlbum", "ImageGalleryPageID > 0", "Created DESC", "", $num);
        }

:)