Jquery鼠标放上去图片放大

<a href="/Upload/Jaeyi/308_20140722102828.JPG" class="tooltip">
<img src="/Upload/Jaeyi/Small/308_20140722102828.JPG" height="40px" alt="输液单" />
</a>

<script src="/Scripts/jquery-1.8.3.min.js" type="text/javascript"></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); //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>