To add this background:

1. Go to Dashboard
2. Click on Layout
3. At the "Add and Arrange Page Elements", click "Add a Gadget"
4. Scroll down to "HTML/JavaScript", and click on the (+) sign
5. At the "Configure HTML/JavaScript", under "Content" paste the following code:

<script>document.write(unescape("%3Cstyle%20type%3D%22text/css%22%3E%0Abody%20%7B background-image %3A%20url%28%22http%3A//img.photobucket.com/albums/v131/aun_t_a/WLO/aaBlogBack3sm.jpg %22%29%3B%20background-position%3A%20center%3B%20background-repeat%3A%20no-repeat%3B%20 background-attachment %3A%20fixed%3B%20%7D%0A%3C/style%3E%0A%3Cdiv%20id%3D%22tag%22%20 style%3D%22position%3Aabsolute %3B%20left%3A0px%3B%20top%3A30px%3B%20z-index%3A50%3B%20 width%3A150px%3B%20height%3A45px%3B%22%3E%0A%3Ca%20href%3D%22 http%3A//aablogbacks.blogspot.com/%22%20target%3D%22_blank%22%3E%0A%3Cimg%20src %3D%22http%3A//img.photobucket.com/albums/v131/aun_t_a/aa_png/aawmark.png%22%20border%3D%220%22/ %3E%0A%3C/a%3E%3C/div%3E%20"));</script>

6. Save!