Hiya, i want to create this look at the bottom of my website where the footer spans all the way across
http://my-real-estate-website.com/

I've managed to figure out how to get it to happen at the top by putting this code into body, text, links page:
background: url("http://practicalbreakupadvice.com/wp-content/themes/atahualpa/images/bg/bg.jpg") repeat-x 0 0;

I have no idea though how to get something similar at the bottom?

My website is:
http://www.practicalbreakupadvice.com

can anyone help me figure out how to do this?

Here is a thread in the FAQ Atahualpa Styling forum that may help you.