Setting a background image inside a window

[Adrián Ortega <elfus0 1 gmail com>]

Hello! I'm programming a small application which gets connected to a 
MySQL database to get info and update the database (that part is already 
taken care of) and the GUI has the following layout:

/******************************************************/
/ Menu bar                                                               
             /
/******************************************************/
/tool bar                                                               
                 /
/******************************************************/
/      USER_AREA                                                        
           /
/      Here I use Gtk::Button's and Gtk::Entry's and             /
/     some other widgets to get and display the                 /
/     database info                                                      
           /
/                                                                      
                       /
/                                                                      
                       /
/******************************************************/
/status bar                                                            
                 /
/******************************************************/

What I'm trying to do is to put a background image in the USER_AREA, so 
the user can get/update the database info and have a friendly and 
good-looking background image.

The images are .jgp and .bmp. I already tried to use Gtk::Image and the 
image is displayed properly, but I'd like to put all the Widgets to work 
with the database on the USER_AREA where the image is located and I 
haven't figured that out yet.

Everything works fine, the only thing I need to do is the background 
image. I haven't discovered yet if this is possible or not, in case it's 
possible, do you know what Widgets I should use to do this? Or some 
reference I can check?

Thank you very much in advance!!