Forum Moderators: phranque
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If they need to upload multiple pictures, then it's probably going to be easiest for them (although more work for you to implement it!) to use a java applet to upload the files. There are one or two open source options available, I've found one called JUpload that seems to work best. If you search in google for it, you should find places where you can download it.
I didn't investigate them too thoroughly, but java FTP programs are also available. From what I can see, there doesn't seem to be any open source implementations of this, so you might have to (shock, horror) buy one.