I think the table is PER_IMAGES, I tried searching for the procedures in USER_PROCEDURES with the word '%IMAGE%' in the name, but no joy. I seem to remember a while ago somebody coming up with a SQL*Loader control file to handle it, but can't remember the details sorry.
You could try uploading a *tasteful* image via the screen, and tracing what the screen does with it?
_________________________
L&K
CT
Remember: A dog is for life, not just for Christmas... unless you're in Korea