Theme Header Not Working

I have the following code in my functions file which works very well as is. I wish to amend the code to display categories instead of pages. However when I make the change I think should work, I loose part of the hover over and click art. Please tell me what I am doing incorrectly:

Original code:

[code moderated according to forum rules - please use the pastebin]

What I changed:

[please mark your code using the 'code' button]

$artThemeSettings['menu.topItemEnd'] . '';
	add_action('get_categories', 'art_header_page_list_filter');
	add_action('wp_list_categories', 'art_list_pages_filter');
	wp_list_categories('title_li=');
	remove_action 'wp_list_categories', 'art_list_pages_filter');
	remove_action 'get_categories', 'art_header_page_list_filter');
}

With this change, the categories do display, but the artwork is lost. I copied the source and learned that what is happening is that the 'art_header_page_list_filter' and/or the 'art_list_pages_filter' are not processing; but I cannot figure out why these functions are being skipped.

thanx,

ken