css problem :(

hey all

im the owner of http://www.blocparty.org . i made it all and installed fgallery. at first, pictures moved to right
i asked this to the author. he told me to edit http://www.blocparty.org/wp-content/plugins/fgallery/fim_photos.php

anyways, i did so and fixed it. however, my header menu was messed up. if you visit http://www.blocparty.org you may see
what im talking about. i think its related to css. how can i fix this? if someone helps i’d be happy