[jQuery] Superfish Menu

Hello, I'm trying to use de Superfish menu in a site i'm developing. I
would like to change the jquery animation but i really don't know how.
In the menu options there is a line like this: "animation :
{opacity:'show'}". But i can't make it work if i change the word
'opacity'.
Thakns in advance and sorry for my bad enshlish :(
Diego