实现的步骤及源码如下：
Default.aspx代码：
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Default.aspx.cs代码：
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using System;
2using System.Collections;
3using System.ComponentModel;
4using System.Data;
5using System.Drawing;
6using System.Web;
7using System.Web.SessionState;
8using System.Web.UI;
9using System.Web.UI.WebControls;
10using System.Web.UI.HtmlControls;
11using UIControl;
12
13namespace PopupMenuControlSample
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PopupMenuControl.js代码：
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2var VisibleSubMenus = '';
3var MenuTimer = 0;
4var CloseTimer = 0;
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7function EnterMenuCell(MenuCell,SubMenuTable)
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PopupMenuControl.css代码：
1.PopupMenuTableStyle
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源码下载地址：