I have a problem with programming images.

I'm creating a file where I have to add about 50 images. These images must
be visible or not depending on some criteria. I would like to know if its
possible to write a code that could make hide or unhide images inserted via:
insert/pictures/from file.

I know I could work with pictures inserted via visual basic tool bar, but
the problem is the memory it needs.

Can you help me, please?

Thanks to all!
Sorry for my poor English...
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atrep