Може ли код за логин форма

Код:
<?php
session_start();
$ime = addslashes($_POST[username]);
$parola = addslashes($_POST[pass]);

$ses = session_id();


include ("conn.php");  // Тука пишеш името на конфиг файла си 


$query = mysql_query("SELECT * FROM `gora` WHERE sesia='$ses'");
$red = mysql_num_rows($query);
if ($red != NULL) {
echo "Потребителя е логнат като:<br/>";
$my_ime = mysql_result($query, "0", "name");
echo "<b>".$my_ime."</b>";
echo "<br/><a href='logout.php'>Излез</a>";
}else{


$query2 = mysql_query("SELECT * FROM gora WHERE name='$ime'");
$r = mysql_num_rows($query2);
if ($r != NULL) {


$query3 = mysql_query("SELECT * FROM gora WHERE  name='$ime' AND passowrd='$parola'");
$r2 = mysql_num_rows($query3);
if ($r2 != NULL) {

$query4 = mysql_query("UPDATE gora SET sesia='$ses' WHERE name='$ime' AND passowrd='$parola'");


echo "Добре дошъл <b>".$ime."</b>.";

}else{
echo "Грешна парола за потребител: <b>".$ime."</b> !";
}
}else{
echo "Няма такъв потребител !";
}
}
?>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<form action="" method="post" /> Потр.Име:<br />
<input type="text" name="username" class="buton" /><br />Парола:<br />
<input type="password" name="pass" class="buton" /> 
<input type="submit" class="buton" value="Влез" />
 
дава ми грешка

Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in C:\AppServ\www\site\login.php on line 13
 

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