Problems with widget placement in sidebar

Hi,

So, I’ve just begun constructing a WordPress blog, using the default ‘Kubrick’ theme as my basic template.

Here’s the address: http://whynotburnbooks.com/blog

Among other things, I’ve increased the width of the theme to 800, following the instructions here: http://i.ndustrio.us/2006/12/19/how-to-widen-your-kubrick-wordpress-theme/.

Things were going OK, but I’m just starting to put widgets in my sidebar. I’ve put in an Amazon Wishlist widget, which is a piece of Java script generated from here: https://widgets.amazon.co.uk/Amazon-Wishlist-Widget/.

If you scroll down to the bottom of my blog, you’ll see that the lower part of the widget has ended up down there, beneath my posts and the rest of the sidebar, instead of where it should be, i.e. with the rest of the widget! For some reason this doesn’t seem to happen in Internet Explorer, but it does in Chrome and Firefox.

Does anyone have any ideas as to what might be causing this? I suspect that I probably screwed something up when I was resizing the theme… but I’m very new to CSS, and don’t know quite what to look for.

Any help would be much appreciated.

Many thanks
David