I have a website which is 960px wide and want to put a picture outside of that on the right side.

Vimeo have done it on there homepage: <http://vimeo.com>
you can see a drawing of an origami bird that sticks outside the website width
without causing the screen to get horizontal scrollbars

How do they do this?!

[origami bird Floating outside of Vimeos layout](http://i.stack.imgur.com/omVJM.jpg)