Find fejlen

Hejsa

Jeg har flg. kode til et login system, men jeg får fejlen:
Parse error: parse error, unexpected $ in /sti/login.php on line 23

Linie 23 er: ?>

<?php
if ((isset($_POST["username"])) && (isset($_POST["password"]))) {
    require("../include/functions.php");
    connect();
    $sql = "SELECT id, nick FROM users WHERE nick='".$_POST["username"]."' AND password='".$_POST["password"]."'";
    $query = mysql_query($sql) or die(mysql_error());
   
    if(mysql_num_rows($query)) {
        while ($row = mysql_fetch_array($query))
        {
        session_start();
        $_SESSION["id"] = $row["id"];
        $_SESSION["nick"] = $row["nick"];
   
        if((isset($_POST["auto"])) && ($_POST["auto"] == "on")){
            $cryptpass = md5($_POST["password"]);
            $str = $_POST["username"]."|".$cryptpass;
            setcookie ("navn", $str, time()+60*60*24*365*2);
        }
    }
}
header("location: index.php");
?>