You can't easily make the sidebar fill the page height. What you can do is put that image in footer, then add these styles.

#footer { position: relative }
#my-puzzles { position: absolute; top: -200px; left: -250px }

<div id="footer">
<img id="my-puzzles" src=" ... " />
...
</div>

Edit "top" and "left" values to match your image height and width.

You will also need to set "min-height" property to #content, otherwise the image will cover your sidebar on short pages.

Or if you want to put a little more effort, fix that "faux columns" issue first, so that your sidebar height will match content.

Then apply the same technique sam2kb demonstrated above. (sidebar->position: relative, puzzles->position: absolute, bottom: 0;)

Btw, why would anyone put a 700px image and define 120px width /: total waste of internetz : D

is it like wordpress?