negative margin widths mean cropped content help…

Hello! I’ve just started using/testing out wordpress, and customising 85ides’s theme to suit… one of the things I’d like to be able to do is have items set with a – margin width, so that they appear outside the usual margins of content. This is a feature that I only intend to use for imbedded film and some images (like my logo).

Can someone help out a relative newbie to the world of wordpress (and css to some extent) on either removing the cropping you can see HERE, or providing an alternative method that achieves the same end result?

Thanks…
Sn0w_chyld.

p.s.
this is my test site… so please excuse the typos etc.

edit..

you can see the cropping that has occored on the vimo filmbox and my logo.