Change skin background to a picture?

Hi I was wondering if you could change the background of the skin, without screwing up the normal settings. Here's a screen shot of what I want to change.

You can add a background image here:

Administration Panel > Display > Colors & Pictures > Pics Management

Advanced Mode
General/Index tab

Background picture (page) :

Here you go:

Code:


body {
/* Background with color */
background-color: blue;
 
/* Background with image */
background-image: url(IMG URL);
 
/* Background with color and image */
background-color: blue url(IMG URL);}

Thanks alot guys!