鼠标滑过出现预览的大图提示效果

当鼠标滑过图片时，图片会出现预览的大图，大图下面还会有介绍文字。
复制代码代码如下:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="图片提示效果.aspx.cs" Inherits="图片提示效果" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
<style type ="text/css" >
.aa{
width:88px;
height :100px;
}

</style>
<script type ="text/javascript" src ="Scripts/jquery-1.7.1.js" ></script>
<script type ="text/javascript" >
$(function () {
var x = 10;
var y = 20;
$("a.tooltip").mouseover(function (e) {
this.myTitle = this.title;
this.title = "";
var imgTitle = this.myTitle ? "<br/>" + this.myTitle : "";
var tooltip = "<div id='tooltip'><img src='" + this.href + "' alt='产品预览图'/>" + imgTitle + "</div>"; //创建<div>元素
$("body").append(tooltip); //将它追加到文本中
$("#tooltip")
.css({
"top": (e.pageY + y) + "px",
"left": (e.pageX + x) + "px"

}).show("fast"); //设置x坐标和y坐标，并且显示
}).mouseout(function () {
this.title = this.myTitle;
$("#tooltip").remove(); //移除
}).mousemove(function (e) {
$("#tooltip")
.css({
"top": (e.pageY + y) + "px",
"left": (e.pageX + x) + "px"
});
});
})
</script>
</head>
<body>
<form id="form1" runat="server">
<div >