editing blogroll output

Hi there, I love the using the blogroll to manage my affiliate links. At the moment, I have an image associated with each links. However, because of my styling for links, the images (which are links) automatically get border around them. I find this annoying. I know how to get rid of the borders, but I can’t figure out how to insert the proper CSS class in the blogroll’s output. Is there a way to alter this?