I ran across some menus at http://www.cssplay.co.uk/ recently and don't understand how it works - but it does.

http://www.peachtreewebs.com/protos/pro_three.html

Specifically, I just don't understand the "b" element in the following CSS code which apparently adds a sliding door effect:

.menu3 li a:hover {color:#fff; background:#000 url(three_1.gif);}
.menu3 li a:hover b {background:url(three_1.gif) no-repeat right top;}

Any illumination would be appreciated.

Thanks

Bob