Access hover of navigation

Is it possible to gain access of :

Code:

---

#nav li:hover

---

I tried many thing but none of them work. I want to change css property of nav li:hover .

http://api.jquery.com/hover/

Use "#nav li" as the selector.

Any particular reason you need jQuery for this?

CSS Code:

#nav li:hover {
    /* set css here? */
}