Phazewun

Okay all im trying to do is Change, the look of the N3 background, i have some custom background that are the correct size and what not. What im looking to do is change the warning message, and the backgrounds. for the backgrounds i burned a CD with a folder BG and put them in there, when i put it in the car it says no available files in the /bg/ folder and im getting extremely frustraded. Can anyone help me please !