鼠标划过图片title 提示实现

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>图片提示</title>
 <!--   引入jQuery -->
 <script src="../../scripts/jquery.js" type="text/javascript"></script>
<style type="text/css">
body{
    margin:0;
    padding:40px;
    background:#fff;
    font:80% Arial, Helvetica, sans-serif;
    color:#555;
    line-height:180%;
}
img{border:none;}
ul,li{
    margin:0;
    padding:0;
}
li{
    list-style:none;
    float:left;
    display:inline;
    margin-right:10px;
    border:1px solid #AAAAAA;
}

/* tooltip */
#tooltip{
    position:absolute;
    border:1px solid #ccc;
    background:#333;
    padding:2px;
    display:none;
    color:#fff;
}
</style>
<script type="text/javascript">
//<![CDATA[
$(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);    //把它追加到文档中                         
        $("#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>
<h3>有效果：</h3>
    <ul>
        <li><a href="images/apple_1_bigger.jpg" class="tooltip" title="苹果 iPod"><img src="images/apple_1.jpg" alt="苹果 iPod" /></a></li>
        <li><a href="images/apple_2_bigger.jpg" class="tooltip" title="苹果 iPod nano"><img src="images/apple_2.jpg" alt="苹果 iPod nano"/></a></li>
        <li><a href="images/apple_3_bigger.jpg" class="tooltip" title="苹果 iPhone"><img src="images/apple_3.jpg" alt="苹果 iPhone"/></a></li>
        <li><a href="images/apple_4_bigger.jpg" class="tooltip" title="苹果 Mac"><img src="images/apple_4.jpg" alt="苹果 Mac"/></a></li>
    </ul>
</body>
</html>