wp_list_categories: highlight current category when viewing single post (v2)

Hello,

I’m reopening this post to see if anyone can help me out with this.
I wanted to adapt this sidebar generating code so that it marks only the current post’s parent and child category with a css current class.

As it is now it marks the parent category of the post and all the child categories used within that parent and I only want the current one.

Here’s the code:

<?php
$catsy = get_the_category();
$myCat = $catsy[0]->cat_ID;
$CatwCount = wp_list_categories('hierarchical=1&use_desc_for_title=0&orderby=name&title_li=&show_count=1&echo=0&depth=2&current_category='.$myCat);
$CatwCount = ereg_replace(' \(([0-9]+)\)', ' <span class="count">[\\1]</span>', $CatwCount);
echo $CatwCount;
?>

[Please post code snippets between backticks or use the code button.]

Can anyone help me out?

Thanks!