Sidebar navigation text goes over the footer!

Hi there,

Please can you take a look at my site

http://www.hairyhand.co.uk/wp

when you expand the navigation tree to its full extent the text hangs over the bottom of the image (i am using firefox) and doesn’t use an overflow effect…I would like the image to expand with the sidebar but at the moment it seems that it only takes notice if there is lots of content of the page. Can anyone advice?

Thanks