[Zope] help! uploading images..

I need to let customers 1) upload a replacement for an image that already exists in the zope tree 2) upload a new image which was not already in the zope tree, and add it to the "images" folder How can I do this? I do not want to simply give the customer write-access to the images folder as this would be both too complex for them, and too insecure. I would prefer to be able to do this from within a form of my own making. --- Julian Morrison Programmer (Zereau Ltd)