you're declaring and initialising the variable my_image, but you're using 
the literal "my_image"
just use image_map {png my_image} instead of image_map {png "my_image"}


(btw, creating camera motion-blur by averaging 24bit images won't give you 
correct results when there are very bright colors in the scene.  I believe 
it's better to use MegaPOV's cameraview-pigment instead: no need for 
temporary-images and it results to accurate motion-blur)

cu!
-- 
#macro G(b,e)b+(e-b)*C/50#end#macro _(b,e,k,l)#local C=0;#while(C<50)
sphere{G(b,e)+3*z.1pigment{rgb G(k,l)}finish{ambient 1}}#local C=C+1;
#end#end _(y-x,y,x,x+y)_(y,-x-y,x+y,y)_(-x-y,-y,y,y+z)_(-y,y,y+z,x+y)
_(0x+y.5+y/2x)_(0x-y.5+y/2x)            // ZK http://www.povplace.com

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