J have problem with customization Lightbox Gallery Plugin for Wordpress.

I can not find a place in the code, which is responsible for vertical alignment "lightbox-nav-btnNext" and "lightbox-nav-btnPrev" in vertical. Each time the top is a strange margin.

java script: http://pastebin.com/1LdyRaTP

CSS: http://pastebin.com/xn7VngQR

Screens: http://imageshack.us/photo/my-images/545/lightboxy.jpg/

Thanks very much for help