[Plugin: Category Posts Widget] Add CSS class dynamically (First & Last items)

Hey,

I need to know how to to add CSS classes dynamically to the final list in cat-posts.php.

E.g.

<li class=”cat-post-item first”>
<li class=”cat-post-item”>
<li class=”cat-post-item”>
<li class=”cat-post-item”>
<li class=”cat-post-item”>
<li class=”cat-post-item”>
<li class=”cat-post-item last”>

At the moment it only has <li class=”cat-post-item”> but I need the first and last so that I can make the CSS look prettier.

Thanks in advance

http://ww.wp.xz.cn/extend/plugins/category-posts/