Fix backround images not extending to bottom of page in democratica

Issue Summary

I love the democratica theme. It works great except for a few minor issues. One of the issues is the left and right sidebar background graphics not extending to the bottom of the page when the right sidebar is longer than the left sidebar and content. Previously, I fixed this by creating a block in the left sidebar with 50 blank lines. The attached solution is much more elegant. I could not put the instructions here because I kept getting an error, so I attached them. You need to edit the two sidebar background graphics and then make minor changes to page.tpl.php and layout.css. See the attached file for the instructions

I learned this technique at A List Apart a great website on css. You can view the article on this at: http://www.alistapart.com/articles/negativemargins/

Thanks
JJ