[Plugin: NextGEN Gallery] Customizing Image Browser

Hi … I need some help in customizing image browser.

I have galleries with 5-10 images inside, never more.

So I want to make a navigation like:
http://enricobardin.it/portfolio.php?dir=2009&subdir=06_Fondazione%20Prada
So I need some other “widget” than the classic “$image->previous_image_link” that is inside imagebrowser.php.

Can you help me?