我只是告诉你方法，不管干什么，方法最重要，给你贴代码，是不负责任，因为那东西到哪都能找到。随便一个网页特效的网站上一大堆。知道方法后，自己实践一下，你会发现你学会了很多东西
<html><head>
<title></title>
<style>
#d1{
position : absolute
left : 300px
top : 10px
width : 50px
height : 50px
background-color : red
z-index : 2
display : none }
</style>
<!-- 修改left : 300px top : 10px 的值可以控制提示框的位置 -->
</head>
<body>
<p>asdfasdfasdfsdfdfg<a href="#" onmouseover="show()" onmouseout="hidden()">鼠标放上来看看</a>sdfhdfh</p>
<div id="d1"></div>
</body>
<script language="javascript" type="text/javascript">
var d1 = document.getElementById('d1')
function show()
{
d1.style.display = 'block'
}
function hidden()
{
d1.style.display = 'none'
}
</script>
</html>
<head><script>
function seeBig(thispic) {
document.all.viewPic.innerHTML="<img src=\""+thispic+"\" >"
}
</script>
<meta http-equiv="Content-Type" content="text/htmlcharset=gb2312" />
<title>无标题文档</title>
<style type="text/css">
<!--
.body {
margin-left: 0px
margin-top: 0px
margin-right: 0px
margin-bottom: 0px
}
.img {border-color:#C0BEBF}
.spic{cursor:pointer}
-->
</style>
</head>
<body>
<table width="763" border="0" align="center" cellpadding="0" cellspacing="0" background="img/bbj.jpg">
<tr>
<td height="41" align="left" valign="top"><table width="763" border="0" align="center" cellpadding="3" cellspacing="3" >
<tr>
<td width="539" rowspan="3" align="left" valign="top"><table width="500" border="0" cellspacing="0" cellpadding="0">
<tr>
<td height="47" align="left" valign="top"></td>
<td colspan="6" align="center" id="viewPic" bgcolor="#FFFFFF"> </td>
</tr>
</table></td>
<td width="10" align="left" valign="top" ><span class="spic" ><img src="http://www.2548.com.cn/d/20050216035/1078708481.jpg" onClick="seeBig(this.src)" width="100" height="60" border="1"></span></td>
<td width="70" align="left" valign="top"><span class="spic"><img src="http://www.2548.com.cn/d/20050216035/1078707649.jpg" width="100" height="60" border="1" onClick="seeBig(this.src)"></span></td>
</tr>
<tr>
<td align="left" valign="top"><span class="spic"><img src="img/3.jpg" width="100" height="60" border="1" onClick="seeBig(this.src)"></span></td>
<td align="left" valign="top"><span class="spic"><img src="img/4.jpg" width="100" height="60" border="1" onClick="seeBig(this.src)"></span></td>
</tr>
<tr>
<td align="left" valign="top"><span class="spic"><img src="img/5.jpg" width="100" height="60" border="1" onClick="seeBig(this.src)"></span></td>
<td align="left" valign="top"><span class="spic"><img src="img/6.jpg" width="100" height="60" border="1" onClick="seeBig(this.src)"></span></td>
</tr>
</table></td>
</tr>
</table>
</body>
