Repeating header image

WordPress 3.5.1
Atahualpa 3.7.11

I am rebuilding http://takerootmontgomery.com/ in WP with ATA and I'm having trouble getting the image for the side shadow to repeat in the header. Ideally, I'd like the image to repeat throughout the whole col two, but I'm guessing i'm not getting the CSS selector right.

I tried doing
div#wrapper {
background:url(http://powerpetition.org/wp-content/...wrapper-bg.png) repeat-y left top;
}

and it doesn't work. I tried some other CSS selectors and they didn't work either. I already have a background image repeating in the body for the green stripe at the top. ATO > Body, Text, & Links >background:#ffffff url('http://takerootmontgomery.org/wp-content/uploads/2013/03/header-bg.png') repeat-x right top;

I'm at a loss. Any help would be great! Thanks!!