If you want to have your own personalized Prev and Nex links, for ANY of the NextGEN gallery pages... Including for the Galleries, Albums or just Images, here is a hack I just made with only CSS:
What you do in CSS is HIDE the "current class", and "page-numbers" class, and "next" class keeping only the one and only link for PREV.
I'll give you everything ready to use here:
Anywhere inside your /view/gallery.php our browse.php files, whatever file you are changing for this... Place this code in place where you want your single NEXT or PREV links to be:
There! Thats how you easily get individual links for anything, to be placed anywhere in your theme! :)
Hope it helps!