hver er fejlen

<?
// Tjekker kun en gang om en cookie er sat.
if (isset($_SESSION["cookie_check"])) {
$_SESSION["cookie_action"] = 'checked';

} else {
echo $_COOKIE["cookie_s_username"];
echo '<br>'.$_COOKIE["cookie_s_password"];
if (isset($_COOKIE["cookie_s_userID"], $_COOKIE["cookie_s_username"], $_COOKIE["cookie_s_password"], $_COOKIE["cookie_s_level"], $_COOKIE["cookie_s_resturant_nr"])) {

$cookie_check = mysql_query("SELECT * FROM user_informations WHERE username='". $_COOKIE["cookie_username"] ."' AND password='". md5($_COOKIE["cookie_password"]) ."'");   
while ($user_check = mysql_fetch_assoc(cookie_check)) {
$s_userID = $user_check["userID"];
$s_username = $user_check["username"];
$s_password = $user_check["password"];
$s_level = $user_check["level"];
$s_restaurant_nr = $user_check["resturant_nr"];
$s_status = $user_check["active"];

session_start();
session_register ("s_userID");
session_register ("s_username");
session_register ("s_password");
session_register ("s_level");
session_register ("s_restaurant_nr");
session_register ("s_status");

setcookie("s_cookie_userID", $s_userID, time()+60*60, "/");
setcookie("s_cookie_level", $s_username, time()+60*60, "/");
setcookie("s_cookie_password", $s_password, time()+60*60, "/");
setcookie("s_cookie_username", $s_level, time()+60*60, "/");
        }
        }
    }
?>

hvad er fejlen i koden

den melder denne fejl

Warning: mysql_fetch_assoc(): supplied argument is not a valid MySQL result resource in c:\websrv\apache\htdocs\lir_zito_dk\mcdnet\includes\functions\cookie_check.php on line 12

på forhånd tak :P