<?php
        $user = $_POST['users'];
        $pass = $_POST['pass'];
        $prefix = '';
        if(!isset($_SESSION['user'])){
            if ($_SERVER['REQUEST_METHOD'] == 'POST') {
                if (empty($user) || empty($pass)) {
                    echo "<center><b>You have left one or more fields blank.</b><br>";
                    echo "<b>Please <a href='javascript:history.go(-1);'>Go Back</a> and try again.</b></center>";
                } else {
                    $return = mysql_query('SELECT * FROM '. $prefix .'users WHERE username=\'' . realEscape($_POST['users']) . '\' AND password=\'' . $_POST['pass'] . '\'') ;
                     if(mysql_num_rows($return) > 0) {
                         while($n = mysql_fetch_array($return)) {
                             $_SESSION['user'] = $n['username'];
                             $_SESSION['user_id'] = $n['userid'];
                             echo "<b>Not being redirected? Click <a href='index.php'>Here!</b></a>";
                             echo "<meta http-equiv=Refresh content=3;url='index.php'>";
                         }
                     } else {
                         echo 'Invalid username and or password.';
                         echo "<b>Please <a href='javascript:history.go(-1);'>Go Back</a> and try again.</b></center>";
                     }
                }
            }
    ?>
    <div id="login">
        <center>
           <form id="login_form" action="index.php" method"post">
             <table style="-moz-opacity: 1.0; opacity: 1.0; filter: alpha(opacity = 100);">
                <tr>
                    <td>Username:</td>
                        <td><input size="20" type="text" name="users" maxlength="12" /></td>
                </tr>
                <tr>
                    <td>Password:</td>
                    <td><input size="20" type="password" name="pass" maxlength="20" /></td>
                </tr>
                <tr>
                    <td></td>
                    <td align="center"><input type="submit" name="loginButton" value="Secure Login" /></td>
                </tr>
              </table>
            </form>
        </center>
    </div>