Kubrick – broken page layout

I was playing around with the header image and the header-img.php file, and when I put everything back the way I found it (or so I thought) my page layout was broken. I’m combing through my css to troubleshoot but so far can find nothing. Help! I’m a newbie and so don’t quite know where to look.

The problem is that the sidebar appears at the page bottom: http://www.daveskitchen.com. the steps I took while playing around were:
In: /wp-content/themes/default/images
1. renamed “kubrickheader.jpg” to kubrickheader_old.jpg
2. dropped in a new image named “kubrickheader.jpg”
viewed page and saw new image in place

3. renamed the new “kubrickheader.jpg” to “daveskitchen.jpg”
4. in header_image.php, changed references to “kubrickheader.jpg” to refer to “daveskitchen.jpg”
a. line 3: $img = ‘kubrickheader.jpg’;
b. line 7: die(header(“Location: kubrickheader.jpg”));
viewed page and saw layout broken (sidebar appears at page bottom)

I then reversed all changes, but the sidebar is still mis-located.

Thanks to anyone who can help