I'm actually trying to change the overall background of the page, not the header. The default background I'm using is a 10x758 black-to-blue gradient called body_bg.gif that matches the blue defined below. The background I'm trying to swap in is a 1024x553 badge image called smartbg_contact_us.gif. Yeah, I know such a large image is bad, but that's what he wants...

PHP Code:
/*wrappers - page or section containers*/
#mainWrapper {
    background-image: url(../images/body_bg.gif);
    background-repeat: repeat-x;
    background-color: #0700D2;
    }