How to use Category Icons with the Thematic theme

This is for version 0.9.7.7 of the Thematic theme.

1. Go to the folder library > extensions
2. Open the file content-extension.php
3. At the line number 672, replace :

$posttitle = '<h2 class="entry-title"><a href="';

by:

$posttitle = '<h2 class="entry-title">'.get_cat_icon('echo=false').'<a href="';

You should also read this post.