Maartenbe,
The best way to have a non-interactive background would to be to create or find an image which you wish to use for the background.
From here on I will take the assumption that your image is named "Background.bmp". If not, simply alter the name and file extension as appropriate.
Then, in the DarkBASIC Pro editor, (note that you must have created this as a 'New Project' in order for Media to be added), click the blue 'Media' tab in the bottom right of the editor and click 'Add'. Browse to your image file, add it and then tick the checkbox asking if it should be moved into the same directory.
By ticking the checkbox, you are saving time as when you go to load the image you can simple type "background.bmp" as the name, rather than something like "C:\Program Files\DarkBASIC Project Images\Background.bmp". Now click OK.
You can load in and use the image by typing "LOAD IMAGE "Background.bmp", 1"
The 1 at the end of the statement is assigning the image to a certain number. From now on, when you want to use this image, you will refer to it as 1.
To get the image onto your screen, you would use "PASTE IMAGE 1, <x co-ordinate>, <y co-ordinate>
So, if you wanted the image to act as a background, you would place it at 0 for the x co-ordinate and 0 for the y co-ordinate, as the point of the image is at the very top left pixel of it.
Hopefully this helps,
Tom