bugged php

<?
session_start();

//Check if session is set
if(isset($_SESSION['gmlogin'])){
    header("Location:index.php");
    }else{
if(isset($_COOKIE["error"])){
    $error = $_COOKIE["error"];
    }
?>
<fieldset>
    <legend>CMS Login Required</legend>
        <?if(isset($error)){ echo "<span style='color:red'>$error</span>"; }else{ /* */ }?>
        <form action="process.php" method="POST">
            <table>
                <tr>
                    <td>Username: </td>
                    <td><input type="text" name="user" /></td>
                </tr>
                <tr>
                    <td>Password: </td>
                    <td><input type="password" name="pass" /></td>
                </tr>
                <tr>
                    <td><input type="submit" value="Login" /></td>
                    <td><input type="reset" value="Clear" /></td>
                </tr>
            </table>
        </form>
</fieldset>