Adding thumbnail to category listing

Hello!

I would like to have a thumbnail image appear next to each category link. I placed an image url in the description field of the category, and I’m using the wp_list_categories function to list the categories.

I thought I might try to use the existing feed_image parameter of wp_list_categories to accomplish it as so:

wp_list_categories
('orderby=id&show_count=1&use_desc_for_title=0&child_of=4&feed_image=category_description');

However, what I end up with is a broken image link with /category_description at the end.

Any ideas how I can accomplish this?

Thanks!

T