[Plugin: NextGEN Gallery] Conflict NextGen with Opera?

I have a strange issue with NextGen, Opera and my theme:

When I view a page with a single picture inside all the thing are ok. But if I click the thumb to view the full size picture, and after I close this picture, the bottom of the page go crazy – https://img560.imageshack.us/img560/8245/crazybottom.jpg
After refresh the page look normaly – https://img138.imageshack.us/img138/5140/normalbottom.jpg

With IE, Firefox or Chrome, the website work fine.

Please, can somebody help me with some advices to solve this big issue?

This is the page.

https://www.ads-software.com/extend/plugins/nextgen-gallery/