Question

i have a part of css code, how can i add this css with jquery ?

div#menu li:hover>div {
    visibility: visible;
}

Answer 1

Although Sarfraz and Anthony’s answers would work there are a couple of points to note.

1) To hide/show you are better just using the hide() and show() mothods available on a jQuery object.

So,

$("div#menu li:hover>div").show();

2) Try to use css classes instead, rather than direct use of the .css() function

3) With your selector, div#menu is pointless. An id selector is faster. All you do when you put the element selector div in front of it is slow it down:

$("#menu li:hover>div").show();

Also, start accepting answers and voting. It good courtesy – It earns people points, which they like, and makes them more inclined to help you in future.