[Plugin: Taxonomy Images] Theme integration

Hi Michael

Firstly thanks for the plugin.. Seems to be exactly what I was after.
However, I am a bit stuck with some parts of integrating it into my theme.`

Please could you point me in the right direction for either of the following?

I am using <?php wp_list_categories( $args ); ?> to create a menu for a particular custom taxonomy and would like to display the Taxonomy image instead of just the name in each link within the returned list. Is this possible?

I am also using print apply_filters( 'taxonomy-images-queried-term-image', '', array('image_size' => 'banner') ); to display the taxonomy image in the header for any archive page but would like to wrap this in an if statement so that it can fallback to a generic image if no taxonomy image has been specified. Again, not sure if this possible? Any help or hints would be really appreciated!

Many thanks
Martin

http://ww.wp.xz.cn/extend/plugins/taxonomy-images/