NNUMBER AGAIN

Hello friends,I've read some posts here about the subject (NNUMBER) and, followinf them, I can make the tail number to show on the fuselage. But I must do something wrong, 'cos I cannot get a similar fuselage color for the DECAL_NNUMBER texture (what I'd really like is a transparent background).I use FSDS3, make a rectangular polygon as a part, call it decal_nnumber, then I apply a texture called DECAL_NNUMBER (I've tried DECAL_NNUMBER.BMP and the same name without any extension)like the one in the plane fuselage. Well, I get a different background when I load the plane in FS9, and no matter the DECAL_NNUMBER texture I apply, I always get the same thing in FS9.Can anybody help me to get a transparent background?Thanks everybody,Daniel