弹出信息框，支持多种浏览器，很多的配置参数。
http://www.walterzorn.com/tooltip/tooltip_e.htm
使用javascript实现层和图片的拖拽。
http://www.walterzorn.com/dragdrop/dragdrop_e.htm
javascript画图库
http://www.walterzorn.com/jsgraphics/jsgraphics_e.htm
javascript 隐藏div
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ded.aspx.cs" Inherits="ded" %>
<!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 runat="server">
<title>oec2003</title>
<style type="text/css">
<!--
#layout {
border: 2px solid #A9C9E2;
background-color: #E8F5FE;
height: 200px;
300px;
}
-->
</style>
<script language="JavaScript" type="text/JavaScript">
function toggle(targetid)
{ if (document.getElementById)
{ target=document.getElementById(targetid);
if (target.style.display=="block")
{ target.style.display="none";}
else {target.style.display="block";}} }
</script>
<style type="text/css">
< #layout{ background-color:#000000; height:400px; 400px;
display:none; }>
</style>
</head>
<body>
<input type="button" id="butn" value="显示/隐藏" onClick="toggle('layout')" />
<center> <div id="layout"></div></center> 居中的DIV </body>
</html>