Nextgen gallery don't scroll

Hello

I’ve installed Nextgen gallery and Nextgen scroll gallery in this site(http://www.esteticasilvia.it/wp/il-centro-estetico/), I’ve created a gallery and putted code in a page.
In FF it works fine but in Safari and in Chrome doesn’t work.

Any suggestion

Thanks in advance

Luca

http://wordpress.org/extend/plugins/nextgen-gallery/