弹出菜单问题

最好避开这种情况 :)MSDNdemo.htm<html>
<head>
<title>网页跨框架菜单 </title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
</head><frameset rows="92,*" cols="*" framespacing="4" frameborder="yes" border="4">
  <frame src="top.htm" name="topFrame" scrolling="NO" >
  <frame src="bottom.htm" name="mainFrame">
</frameset>
<noframes><body></body></noframes>
</html>
top.htm<html>
<head>
<title>MSDN的示例</title>
<script>
var oPopup = window.createPopup();
function richContext()
{
    var lefter2 = event.offsetY+0;
    var topper2 = event.offsetX+15;
    oPopup.document.body.innerHTML = oContext2.innerHTML; 
    oPopup.show(topper2, lefter2, 210, 84, contextobox);
}
</script>
</head>
<body> <span id="contextobox" style="  cursor:hand; margin-left:5px; margin-right:10px; background:#e4e4e4; width:300; height:40; padding:20px;" oncontextmenu="richContext(); return false"  >Right-click inside this box.</span><DIV ID="oContext2" STYLE="display:none">
<DIV STYLE="position:relative; top:0; left:0; border:2px solid black;  border-top:2px solid #cccccc; border-left:2px solid #cccccc; background:#666666; height:110px; width:207px;"> 
  <DIV STYLE="position:relative; top:0; left:0; background:#cccccc; border:1px solid black; border-top: 1px solid white; border-left:1px solid white; height:20px; color:black; font-family:verdana; font-weight:bold; padding:2px; padding-left:10px; font-size:8pt; cursor:hand" onmouseover="this.style.background='#ffffff'" onmouseout="this.style.background='#cccccc'" onclick="top.mainFrame.location.href='http://www.microsoft.com';"> 
    &nbsp;&nbsp;Home</DIV>
  <DIV STYLE="position:relative; top:0; left:0; background:#cccccc; border:1px solid black; border-top: 1px solid white; border-left:1px solid white; height:20px; color:black; font-family:verdana; font-weight:bold; padding:2px; padding-left:10px; font-size:8pt; cursor:hand" onmouseover="this.style.background='#ffffff'" onmouseout="this.style.background='#cccccc'" onclick="top.mainFrame.location.href='http://search.microsoft.com';"> 
    &nbsp;&nbsp;Search</DIV>
  <DIV STYLE="position:relative; top:0; left:0; background:#cccccc; border:1px solid black; border-top: 1px solid white; border-left:1px solid white; height:20px; color:black; font-family:verdana; font-weight:bold; padding:2px; padding-left:10px; font-size:8pt; cursor:hand" onmouseover="this.style.background='#ffffff'" onmouseout="this.style.background='#cccccc'" onclick="top.mainFrame.location.href='http://www.microsoft.com/ie';"> 
    &nbsp;&nbsp;Intenet Explorer</DIV>
  <DIV STYLE="position:relative; top:0; left:0; background:#cccccc; border:1px solid black; border-top: 1px solid white; border-left:1px solid white; height:20px; color:black; font-family:verdana; font-weight:bold; padding:2px; padding-left:10px; font-size:8pt; cursor:hand" onmouseover="this.style.background='#ffffff'" onmouseout="this.style.background='#cccccc'" onclick="top.mainFrame.location.href='http://www.microsoft.com/info/cpyright.htm';"> 
    &#169;2001 Microsoft Corporation</DIV>
</DIV></body>
</html>
bottom.htm<html>
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
</head><body></body>
</html>