Why cannot get a hidden input value by POST method?

[GAEFans]

OS: windows XP
SDK: Google App Engine 1.1.3 (Django / 0.96.1)

template snippets:
...
<form action="/delemployeeinfo/" method="post">

<input type="hidden" name="myKey" vlaue="{{myKey}}" />
<input type="hidden" name="numkeys" vlaue="{{numkeys}}" />

<table cellspacing="2" cellpadding="2" border="0" class="rowmajor">
  <tbody>
    <tr>
      <th class="vt">E-mail:</th>
      <td class="inplace" colspan="2">
        <input value="{{email}}" name="email" id="email"
readonly="readonly"/>
      </td>
    </tr>

    <tr>
      <th class="vt">password:</th>
      <td class="inplace" colspan="2">
        <input value="{{password}}" name="password" id="password"
readonly="readonly"/>
      </td>
    </tr>

    <tr>
      <th class="vt">realName:</th>
      <td class="inplace" colspan="2">
        <input value="{{realName}}" name="realName" id="realName"
readonly="readonly"/>
      </td>
    </tr>
  </tbody>
</table>

<div style="padding: 6px;">
  <input type="submit" value="Delete" name="submit" id="submit" />
</div>
</form>


Debug infos:
BadKeyError at /delemployeeinfo/
Invalid string key

numkeys         ''
realName        '\xe9\x87\x91\xe5\x81\xa5\xe5\xba\xb7'
submit  '\xe5\x88\xa0 \xe9\x99\xa4'
password        '1'
email   '[EMAIL PROTECTED]'
myKey   ''

view source by right click on FireFox:
...
<form action="/delemployeeinfo/" method="post">

<input type="hidden" name="myKey"
vlaue="agxtZWV0aW5nLXJvb21yDgsSCEVtcGxveWVlGBUM" />
<input type="hidden" name="numkeys" vlaue="1" />

<table cellspacing="2" cellpadding="2" border="0" class="rowmajor">
  <tbody>
    <tr>
      <th class="vt">E-mail:</th>
      <td class="inplace" colspan="2">
        <input value="[EMAIL PROTECTED]" name="email" id="email"
readonly="readonly"/>
      </td>
    </tr>

    <tr>

      <th class="vt">password:</th>
      <td class="inplace" colspan="2">
        <input value="1" name="password" id="password"
readonly="readonly"/>
      </td>
    </tr>

    <tr>
      <th class="vt">realName:</th>
      <td class="inplace" colspan="2">

        <input value="Tom" name="realName" id="realName"
readonly="readonly"/>
      </td>
    </tr>
  </tbody>
</table>

<div style="padding: 6px;">
  <input type="submit" value="Delete" name="submit" id="submit" />
</div>
</form>

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