Hi Gnordo,
If you go to the "Manage Images" page within your Auctiva account, you can tell how many active listings each image is being used in based on the value in the "Listings" column. If you are just looking to delete all of your images that are no longer being used in active listings, you should be able to delete any images that have a zero in the "Listings" column.
Also, when you delete images from the "Manage Images" page within your Auctiva account, we will keep them in the "Deleted Images" folder within your account for 7 days until we permanently delete them. If you would like them to be permanently deleted right away after marking them as deleted, you can then click the "View Deleted Images" button at the bottom of your "Manage Images" page and permanently delete them by using the "Remove Permanently" button on the ensuing page.
If you have any additional questions or concerns, please feel free to contact our customer support team by completing the web form on the following page of our site:
http://www.auctiva.com/help/requesthelp.aspx
-Mike