Login page for developing simple voting system with PHP

The administrator login page is in the admin.php file

<form action="" method="post">
  <table width="" border="0" align="center" cellpadding="5" cellspacing="1" bgcolor="#C2C2C2">
    <tr>
      <td height="30" align="right" bgcolor="#FFFFFF"><label>输入密码：</label></td>
      <td align="left" bgcolor="#FFFFFF"><input name="pwd" type="text" id="pwd" /></td>
    </tr>
    <tr>
      <td height="30" colspan="2" align="center" bgcolor="#FFFFFF"><label>
          <input name="Submit10" type="submit" id="Submit10" value="登陆" />
        </label>
        <label> &nbsp;
          <input type="reset" name="Submit5" value="重置" />
        </label></td>
    </tr>
    <tr>
      <td height="30" colspan="2" align="center" bgcolor="#FFFFFF">
      </td>
    </tr>
  </table>
</form>

id="Submit10", here we set a login password$pwd = admin,

administrator operation page.

The password pwd value obtained using POST method matches the pwd value of SESSION. If the password entered in the <input> text box is admin, the login is successful and you will jump to Operation page; otherwise it will prompt login failure.

<?php
if(isset($_POST['Submit10'])){
  if($_POST['pwd']=='admin'){

    $_SESSION['pwd']=2;

    echo "<script language=javascript>alert('登陆成功！');window.location='admin.php'</script>";
  }else{
    echo "<script language=javascript>alert('登陆失败,请检查您的密码！');window.location='admin.php'</script>";
  }
}
?>