[Plugin: NextGEN Scroll Gallery] douesnt work on my theme :(

Hi,
I would love to use the scroll gallery on my page, but it doesnt seem to work with my theme. I mean the gallery itself works just fine, but it affects the sliding menu on my website http://www.dennisworship.com/ . When I activate the plugin (not use, just activate) the sliding menu gets stuck like 200px from the right side – like if there would be something else. NextGen gallery works ok.
Any ideas why this happens?
Thanks a lot
Hanka

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