Login Script error

I’m trying to follow a login tutorial but I keep getting an error. The error I get is:

[code=php] Notice: Undefined index: id in c:inetpubwwwrootLoginregister.php on line 10

Notice: Undefined index: code in c:inetpubwwwrootLoginregister.php on line 11

Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in c:inetpubwwwrootLoginregister.php on line 16
Your account could not be activated![/code]

And my php is:

[code=php]<?
/* Account activation script */

// Get database connection
$db = mysql_connect(“localhost”);
mysql_select_db(“login”);

// Create variables from URL.

$userid = $_REQUEST[‘id’];
$code = $_REQUEST[‘code’];

$sql = mysql_query(“UPDATE users SET activated=’1′ WHERE

userid=’$userid’ AND password=’$code'”);

$sql_doublecheck = mysql_query(“SELECT * FROM users WHERE

userid=’$userid’ AND password=’$code’ AND activated=’1′”);
$doublecheck = mysql_num_rows($sql_doublecheck);

if($doublecheck == 0){
echo “<strong><font color=red>Your account could not be

activated!</font></strong>”;
} elseif ($doublecheck > 0) {
echo “<strong>Your account has been activated!</strong> You may

login below!<br />”;
include ‘login_form.html’;
}

?>[/code]

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