Erratum: The example CSS file, stylesheet_categories_dressing.css, should have a class added to this declaration to function properly in all circumstances:
Code:
#categories a.category-top.catText:hover {
    background-color: #ddeeff; 
    color: #554433; 
    background-image: url(../images/catbghover.gif);
    }
Add .catText as shown to limit background hover effects to text-based links and leave background-image-based links to their own swapping operation.

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Also, further testing has shown a puzzling bug in IE6 handling of CSS bullets for subcategories. It is treating the subcat tags as if they were top cats, even though they do not have top cat tags and have separately styled subcat tags. Meanwhile, Firefox of course handles all the different conditions as designed.

Stay tuned for further info if this feature matters to you.