连接框架问题

  代码如下：  
<title>菜单页</title>
</head>
<body style="margin:0;font-size: 12px;">
    <form id="form1" runat="server">
    <div style="background-color:#666666;width:100%;">
    <table style=" width:150px; height:320px">
        <tr>
            <td style="height:30px; width:98%; background-color:#CCCCCC; text-align:center;">
            【--系统菜单--】
            </td>
        </tr>
        <tr>
            <td style="height:30px;width:98%;color:White;">
               &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a style="color:White; text-decoration:none" href="#" onclick="window.top.frames['main'].location='ReaderManage/WF_ReaderList.aspx'">◇ 读者管理</a> 
            </td>
        </tr>
        <tr>
            <td style="height:30px;width:98%;color:White;">
               &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a style="color:White; text-decoration:none" href="#" onclick="window.top.frames['main'].location='WF_ProfessionManage.aspx'" >◇ 专业管理</a>
            </td>
        </tr>
        <tr>
            <td style="height:30px;width:98%;color:White;">
               &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a style="color:White; text-decoration:none" href="#" onclick="window.top.frames['main'].location='WF_Default.aspx'">◇ 返回首页</a>
            </td>
        </tr>
        <tr>
            <td style="height:100%"></td>
        </tr>
    </table>
    </div>
    </form>
</body>
我再后台点击onclick 但是页面没有跳转 。谁知道是怎么回事？