[Plugin: WP-PostRatings] On hover reset/remove original score

hellow,

I’m asking for some tips how to do next:
When user would like to rate post(hover),current score must remove or reset(from bg or smth) to show only what’s user want to choose.

Sry for my bad english and thanks for any help 😉

http://wordpress.org/extend/plugins/wp-postratings/