Image on post duplicate

Hi Szabi, I placed in feed to post generator in default image list, 10 images so they wont be repeated when they are posted 2 or more posts from same category. If you check www.lawnewsweek.com on the Breaking News section there are for example four bankruptcy law articles but the same image repeats on them. How can I do so that images won't repeat when 2 or more articles of the same category are posted? Thanks.