zoomed in picture

I put a jpg picture on to part of a mesh, but it has zoomed in, so i only see the center of the picture!
it is on a curved surface but i had to set the map thing at cube for the picture to be visable.
I can see the whole mesh. so it is not the camera that has zoomed!
as i am nowhere near being good at blender please explain clearly what i have to do.
thanks all
ver 2.41

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