Background image in footer

Hi!
I’ve searched the forums but couldn’t find an answer that fixed my issue, so here it goes: how do I get a background image in the footer area while keeping the background-color? I’ll post the link to the site and an image of the desired result in the private content section. I’ve tried the following CSS:

#footer {
background-image: #666666 url(‘http://url_of_img’) bottom center no-repeat scroll;
}

Thanks!