密码强度检测函数（正则）

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                          <p align="center"><font color="#ff0000">用户名或密码错误，请重新输入。</font></p> 
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      <td align="right" width="25%">帐号/编号:</td> 
      <td width="25%"><input class="doc_txt" maxlength="20" name="LoginName" size="10" type="text" value=""/></td> 
      <td align="right">密码: <input class="doc_txt" maxlength="20" name="Pwd" onkeyup="isSecurity(this.value);" size="10" type="Password" value=""/></td> 
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            <td align="right" width="36%"><font class="red" id="A">密码强度检测</font> </td> 
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