1). go in C:\Program Files\Sports Interactive\Football Manager 2007\data\graphics\backgrounds
2). delete and save your deflalt pic to my document(anywhere)...
3). then paste u new picture to C:\Program Files\Sports Interactive\Football Manager 2007\data\graphics\backgrounds and alter u pic name to "deflaut"..
=therefore there will be only one deflaut pic in
C:\Program Files\Sports Interactive\Football Manager 2007\data\graphics\backgrounds