Copying images and organizing from website

Migrating content to a new website. Our current website has hundreds of pictures but no way of exporting and the CMS saves them with unique names. I need these images (the full resolution ones - not the thumbnails) saved into folders named for the Gallery they are displayed in. No authentication required, all are in public non-flash galleries. The galleries are in a hierarchical structure and folders with images should be in the same structure, again named the same as the gallery. Image filenames can remain the same. The URL to the root of the gallery is - [login to view URL] As a bonus you can choose to save any text description of image and image filename to a csv file so I can import the descriptions at a later time to the new site. Please quote on this separately as if it is too much I won't do this part. Full structure of saved files to be zipped up into one file and provided as deliverable. Thank you.