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Also, if there are images in that particular directory, how are they being linked to? And are you using absolute or relative URLs for images and pages?
Crawlers follow links, so take a look at what you've got that they're following.
How are the files in those directories being linked to?
The solution would be having a default script (index.php) which would output 404 header and thus prevent directory itself from being listed.
I tend to put dummy index.html files in directories like that, which redirect users to a more appropriate page. I've observed that people may access an image directly, then attempt to go to the directory it is in (could be using the "up" button on a toolbar). I decided a redirect was better than showing them raw directory contents or (as I have directory level access disabled) a 403 error.
Hope that is of some help.
Alden.