OOPs...if you're actually 'relisting' I don't think it will work. I don't know if you can edit listings that are being relisted..You'd have to use Auctivas 'create similar', change the pics, and just post or schedule.
Check this out:
http://www.auctiva.com/free-auction-software-help/help....relist-schedule-edit
So even if you are using 'create similsr' you can't actually edit pics...