You cant have a bitmap in a jpeg as there two different file types.
Whats the geometry that your assigining it to? If its a poly object them you might have to uv map it, although you can get round it using the projection utitlty that way you can then move the image to match where you want it then bake it so it stays in place.
Have a look for projection and for planar mapping (as this might help you too) in the help files as these would better explain how to do it.
"No pressure, no diamonds" Thomas Carlyle