显示效果如下:

实现代码如下:PopupMenu.htm
<!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>工具条上的弹出式菜单</title>

<style type="text/css">...
a:link

{...}{
color: #000;
text-decoration: none;
font-weight: normal;
padding: 0px 0px 2px 0px;
font-size: 12px;
display: block;
}
a:visited

{...}{
color: #000;
text-decoration: none;
font-weight: normal;
padding: 2px 0px 0px 0px;
font-size: 12px;
display: block;
}
a:hover

{...}{
color: #000;
text-decoration: none;
padding: 0px 0px 2px 0px;
font-size: 12px;
display: block;
}
a:active

{...}{
color: #000;
text-decoration: none;
padding: 2px 0px 0px 0px;
font-size: 12px;
display: block;
display: block;
}

.MenuItem

{...}{
display:block;
width:60px;
height:20px;
font-size: 12px;
float:left;
text-align:center;
padding:2px 0px 0px 0px;
}
</style>


<script type="text/javascript">...

var popup = window.createPopup();
var width;
var height;
function Pop_menu(divMenuList,width,height,toolbarMenuItem)

...{
popup.document.body.innerHTML = divMenuList.innerHTML;
popup.show(0,24,width,height,toolbarMenuItem);
// 0 和 23 是相对于toolbarMenuItem元素左上角的坐标点(x,y)
// width 显示菜单的宽度
// height 显示菜单的高度
// toolbarMenuItem 要弹出菜单的对象
}

</script>

</head>
<body>


<!--菜单条-->
<div id="toolbar_menu" style="width: 100%; height: 20px; background-color: #ece9d8;
border: darkgray 1px solid;">
<!--菜单元素-->
<div id="MenuItem1" class="MenuItem">
<a href="#" onfocus="Pop_menu(filMenuList,120,125,MenuItem1)" accesskey="F">文件(<u>F</u>)</a></div>
<div id="MenuItem2" class="MenuItem">
<a href="#" onfocus="Pop_menu(filMenuList,120,125,MenuItem2)" accesskey="E">编辑(<u>E</u>)</a></div>
<div id="MenuItem3" class="MenuItem">
<a href="#" onfocus="Pop_menu(filMenuList,120,125,MenuItem3)" accesskey="V">视图(<u>V</u>)</a></div>
<div id="MenuItem4" class="MenuItem">
<a href="#" onfocus="Pop_menu(filMenuList,120,125,MenuItem4)" accesskey="S">网站(<u>S</u>)</a></div>
<div style="clear: both;">
</div>
</div>
<!--文件菜单-->
<div id="filMenuList" style="display: none;">
<!--菜单列表元素-->
<div style=" width: 120px; height:auto; background-color: #eee; border: darkgray 1px solid;">
<div onmousemove="this.style.color='white'; this.style.background='#4169e1';" onmouseout="this.style.color='black';this.style.background='#eee'">
<span onclick="parent.location.href='http://blog.youkuaiyun.com/qghboy'" style="cursor: hand; height:20px;font-size:12px; padding:5px;">我的优快云博客</span>
</div>
<div onmousemove="this.style.color='white'; this.style.background='#4169e1';" onmouseout="this.style.color='black';this.style.background='#eee'">
<span onclick="parent.location.href='http://blog.youkuaiyun.com/qghboy'" style="cursor: hand; height:20px;font-size:12px; padding:5px;">我的优快云博客</span>
</div>
<div onmousemove="this.style.color='white'; this.style.background='#4169e1';" onmouseout="this.style.color='black';this.style.background='#eee'">
<span onclick="parent.location.href='http://blog.youkuaiyun.com/qghboy'" style="cursor: hand; height:20px;font-size:12px; padding:5px;">我的优快云博客</span>
</div>
<div onmousemove="this.style.color='white'; this.style.background='#4169e1';" onmouseout="this.style.color='black';this.style.background='#eee'">
<span onclick="parent.location.href='http://blog.youkuaiyun.com/qghboy'" style="cursor: hand; height:20px;font-size:12px; padding:5px;">我的优快云博客</span>
</div>
<div onmousemove="this.style.color='white'; this.style.background='#4169e1';" onmouseout="this.style.color='black';this.style.background='#eee'">
<span onclick="parent.location.href='http://blog.youkuaiyun.com/qghboy'" style="cursor: hand; height:20px;font-size:12px; padding:5px;">我的优快云博客</span>
</div>
</div>
</div>
</body>
</html>

提示:最为重要的就是
<script type="text/javascript">
var popup = window.createPopup();
var width;
var height;
function Pop_menu(divMenuList,width,height,toolbarMenuItem)
{
popup.document.body.innerHTML = divMenuList.innerHTML;
popup.show(0,24,width,height,toolbarMenuItem);
// 0 和 23 是相对于toolbarMenuItem元素左上角的坐标点(x,y)
// width 显示菜单的宽度
// height 显示菜单的高度
// toolbarMenuItem 要弹出菜单的对象
}
</script>
++++++++++++++++++++++++++++++++++
还有就是:通过 window.createPopup().show () 弹出来的菜单实际上脱离了父页面,所以父页面上的样式表对 弹出来的菜单界面是不起作用的。