<script type="text/javascript" src="http://www.webdesignerwall.com/demo/jquery/jquery.js"&gt;

<script type="text/javascript">
$(document).ready(function(){
$(".menu li").hover(function() {
$(this).find("em").animate({opacity: "show",top: "-75"},"slow");
},function() {
$(this).find("em").animate({opacity: "hide",top: "-85"},"fast");
});
});

<style type="text/css">
body {
margin: 10px auto;
width: 570px;
font: 75%/120% Arial,Helvetica,sans-serif;
}
.menu {
margin: 100px 0 0;
padding: 0;
list-style: none;
}
.menu li {
padding: 0;
margin: 0 2px;
float: left;
position: relative;
text-align: center;
}
.menu a {
padding: 14px 10px;
display: block;
color: #000000;
width: 144px;
text-decoration: none;
font-weight: bold;
background: url('https://files.jb51.cc/file_images/article/201703/button.gif') no-repeat center center;
}
.menu li em {
background: url('https://files.jb51.cc/file_images/article/201703/hover.jpg') no-repeat;
width: 180px;
height: 45px;
position: absolute;
top: -85px;
left: -15px;
text-align: center;
padding: 20px 12px 10px;
font-style: normal;
z-index: 2;
display: none;
}

<ul class="menu">