Wordpress Themes - WP Forum at BFA - Trouble changing icons for category pages in top navigation menu

this is my site:
http://monte.robotsheep.com/

i have four items in the top nav menu:
home - link to url
nolan - category
ken - category
about - link to page

this is what i added into the menus_menu1.css:

Code:

/* Part 1- for default state: */

#menu1 .item-home > a > i { background-position: 0px 0px; }

#menu1 .cat-?cat=3 > a > i { background-position: 0px -24px; }

#menu1 .cat-?cat=2 > a > i { background-position: 0px -48px; }

#menu1 .page-about > a > i { background-position: 0px -72px; }

/* Part 2 - for hover state: */

#menu1 .item-home:hover > a > i, #menu1 .item-home.active > a > i { background-position: -24px 0px; }

#menu1 .cat-?cat=3:hover > a > i, #menu1 .cat-?cat=3.active > a > i { background-position: -24px -24px; }

#menu1 .cat-?cat=2:hover > a > i, #menu1 .cat-?cat=2.active > a > i { background-position: -24px -48px; }

#menu1 .page-about:hover > a > i, #menu1 .page-about.active > a > i { background-position: -24px -72px; }

as you can see, i was able to change the icon for the ABOUT button. "US"
but the two icons for the category buttons NOLAN & KEN don't show up. should read "NL" and "KN"

i can't figure out why it works for one thing and not the other.

thanks so much for any advice.