Category Avatar/Picture automatically next to the post

I have a lot of different categories and i want an avatar/images displayed on each and every post made.

So if i select the category ‘news’ for example there would be a image (with padding 5px) on the left (top) of the textual content. When it’s another category the apropriate avatar/image appears for it.

However if there are more categories selected, for example if a message is ‘news’ and about ‘tech’ there should only be one avatar/image. Perhaps the first one.

I prefer if it loads automatically simply because i work with 10 other posters and none of them have any html knowledge, besides that it saves a lot of time.

An example: volkomenkut.com (dutch site, but it draws the picture)

Iam using wp1.5.2 and a blix theme