You could just use: {in and out function callback}
$(".result").hover(function () {
$(this).toggleClass("result_hover");
});
For your example, better will be to use CSS pseudo class :hover: {no js/jquery needed}
.result {
height: 72px;
width: 100%;
border: 1px solid #000;
}
.result:hover {
background-color: #000;
}