CSS menu trick
I wrote this post a while back. The content can still be relevant but the information I've linked to may not be available.
Changing the hover state of a link in response to a mouseover event is a common CSS technique, for example by positioning a background image in a navigation list. However, in this example, the other items in the list have their background changed in response to a mouseover event.
Not seen this used before. Interesting idea.