http://www.codefans.net/jscss/code/4967.shtml
<!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>
<title>jquery悬停时的图片提示</title>
<script src="/ajaxjs/jquery-1.6.2.min.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>jquery图片提示效果：把你的鼠标放在图片上试试：</h3>
<ul>
<li><a href="/jscss/demoimg/wall5.jpg" class="tooltip" title="风景好美"><img src="/jscss/demoimg/wall_s5.jpg" alt="风景好美" /></a></li>
<li><a href="/jscss/demoimg/wall7.jpg" class="tooltip" title="绿色自然"><img src="/jscss/demoimg/wall_s7.jpg" alt="绿色自然"/></a></li>
</ul>
</body>
</html>