Problém (asi) s Mysql_Fetch_Array($query)

<?php

session_start();
ob_start();
require ("header.php");
if(isset($_POST["login"])){
  $name = $_POST["login"];
  $password = $_POST["password"];
  $pass = md5($password);
    $query = MySQL_Query("SELECT * FROM `users` WHERE `username` = '$name' and `password` = '$pass' and `rank` = '10'") or die (mysql_error());
      $vysledek = Mysql_Fetch_Array($query);
        if($vysledek==TRUE){
        session_register("sign");
        session_register("login");
        session_register("id");
        $_SESSION["sign"] = 1;
        $_SESSION["login"] = $vysledek["username"];
        $_SESSION["id"] = $vysledek["id"];
        $location1="./post_news.php";
        header("location: http://$location1/"); 
        }
        else{
          
          echo "<script language=\"javascript\" type=\"text/javascript\">alert('Zadal jsi špatné údaje'); </script>";
          header("location: http://$homepage/");
        }
    mysql_free_result($query);
}else{
  echo "<br> Musíte zadat všechny údaje!";
}
ob_end_flush();
?>