弹出框登陆

<div id="forlogin" style="display:none;">

<form id="formid">
<table width="100%" border="0" align="center" cellpadding="4" cellspacing="4" bordercolor="#666666">
  <tr>
    <td colspan="2" bgcolor="#eeeeee">用户登陆</td>
  </tr>
  <tr>
    <td width="50" align="right">用户名</td>
    <td>
      <input type="text" id="username" name='username'/><span id="re"></span></td>
  </tr>
  <tr>
    <td align="right">密　码</td>
    <td>
      <input type="text" id="userpwd" name='pwd' />  </td>
  </tr>
  <tr>
  <td> 验证码</td>
 
       <td><input name="verify" type="text" id='vf' class="small text" size="5" />
         <img src="__APP__/Member/verify" name="verifyImg" width="33" height="21" id="verifyImg" >[ <a href="javascript:fleshVerify()">看不清？</a> ]</td>
   </tr>
</table>
</form>
</div>
<!--end-->

</body>
</html>
    <script type="text/javascript" src="__PUBLIC__/js/Dialog.js"></script>
        <load type="css" href='__PUBLIC__/css/common.css' />
<script type="text/javascript">
function zOpenEle(){
var diag = new Dialog("Diag4");
diag.Width = 300;
diag.Height = 100;
diag.Title = "用户登录";
diag.innerElementId="forlogin"
diag.OKEvent = function(){
$E.getTopLevelWindow().$("username").value||alert("用户名不能为空");
$E.getTopLevelWindow().$("userpwd").value||alert("密码不能为空")
checkuser();
};//点击确定后调用的方法
diag.show();
}
</script>
    <load href="__PUBLIC__/js/jquery.form.js" />
<script language="JavaScript">
    <!--
    function checkuser(){
        jq.post('__APP__/Member/checkLogin',{'user':jq('#username').val(),'pwd':jq('#userpwd').val(),'verify':jq('#vf').val()},function(data){
  if (data.status==1){
jq('#re').html("登录成功");
window.location.reload();
            }else{
                jq('#re').html("登录失败");
            }


        },'json');
    } 

</script>

// 登录检测
    public function checkLogin()
    {
        if (empty($_POST['user']))
        {
            $this -> error('帐号错误！');
        } elseif (empty($_POST['pwd']))
        {
            $this -> error('密码必须！');
        } elseif (empty($_POST['verify']))
        {
            $this -> error('验证码必须！');
        } 

        if ($_SESSION['verify'] != md5($_POST['verify']))
        {
            $this -> error('验证码错误！');
        } 
           // 保存登录信息
         $Form = M("Student");
         $user = strip_sql($_POST['user']);
         $pwd = strip_sql($_POST['pwd']); // md5($_POST['pwd']);
         $t = $Form -> where("qq=$user and password=$pwd") -> select(); //var_dump($t);
        if ($t)
        {
            $this -> success('登录成功');
        } 
        else
        {
            $this -> error('登录失败!');
        } 
        
    }