Untitled

<?php
function showForm($error="LOGIN"){
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
                      "DTD/xhtml1-transitional.dtd">
<html>

    <!DOCTYPE html>
    <html lang="en">

    <head>

    </head>

<body>
        <style>
            .border {
                border: 1px solid black;
            }

            .buttonfont {
                font-family: "Trebuchet MS";
                font-size: 16px;
            }

            .hidelink {
                color: black;
                text-decoration: none;
            }
        </style>
        <center>
            <span style="font-family:Trebuchet MS"><h2>Login to Admin Panel</h2>
        </center>

  <span style="font-family:Trebuchet MS">

 <div class="border" style="margin-left: 45%; width: 20%; height: 120px;">
    <br>

  <form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post" name="pwd">
    &nbsp; Password
     <table>
       <tr>
         <td><input name="passwd" type="password"/></td>
       </tr>
       <tr>
         <td align="center"><br/>
          <input type="submit" name="submit_pwd" value="Login"/>
         </td>
       </tr>
     </table>
   </form>

                    </span>
                </div>

    </body>

    </html>
<?php
}
?>
<?php
$password = 'DTportal_20';

if (isset($_POST['submit_pwd'])){
   $pass = isset($_POST['passwd']) ? $_POST['passwd'] : '';

   if ($pass != $password) {
      showForm("Wrong password");
        echo "<script type=\"text/javascript\">window.alert('Incorrect Password!');
window.location.href = 'admin_panel.php';</script>";
      exit();
   }
} else {
    showForm();
    exit();
} ?>