Add 32x32 icon to custom post type index page

Question

I've setup an "album" custom post type and want to add an icon on the index page where the RED circle is (see image below; from wptheming.com).

Here's my function to replace the icon. The CSS is what I found when I inspected the icon element with firebug:

add_action('admin_head', 'album_foo');
function album_foo() {
        global $post_type;
    ?>
    <style>
    <?php if ($post_type == 'album') : ?>

     #icon-album.icon32.icon32-posts-album {
      background:url('<?php get_template_directory_uri(); ?>/images/album32x32.png') no-repeat;
    } 
    <?php endif; ?>
        </style>
        <?php
}

I also tried this CSS in the function:

#icon-edit.icon32-posts-album {
        background:url('<?php get_template_directory_uri(); ?>/images/album32x32.png') no-repeat;
}

I can't figure out what my CSS is missing, but my icon isn't showing.