Userlogin system seems to override the if statement....

[twistednetadmin <twistednetadmin@xxxxxxxxx>]

I'm new to this. So I used a tutorial to write this. But it shows "Login ok.
Welcome" at once when the page loads. Here is the tutorial:
http://www.ss32.x10hosting.com/ss32/files/PHP-logins.pdf
<?php
include ("DBconnection");


session_start();
$err = 0;
echo $err; //just to check. Shows 0
$sql_login = sprintf("SELECT 'name', 'pass' FROM DB
WHERE 'name'='%s' AND 'pass'='%s'", @$_GET['name'],@md5($_GET['pass']));
$login = mysql_query($sql_login) or die(mysql_error());
if (mysql_num_rows($login) == 0) {
$GLOBALS['MM_username'] == @$_GET['name'];
echo $err; //just to check. Shows 0
session_register("MM_username");
echo $err; //just to check. Shows 0
$err = 1;


}
echo $err; //just to check. Shows 1
?>
<!-- Form -->
<?php
if ($err != 1) {
if ($err == 2) { ?>
There was an error processing your login.
<?php } ?>
<table>
<form action="<?php $_SERVER['PHP_SELF']; ?>" method="get">

<tr>
<td align="center" valign="middle" class="maintext">
Login as:<input name="name">
</td>
</tr>
<tr>
<td align="center" valign="middle" class="maintext">
Password:<input name="pass" type="password"><br>
</td>
</tr>
<tr>
<td align="center" valign="middle" class="maintext">
<input type="image" src="images/login_btn.jpg" value="login"></td>
</tr>
</form>
</table>

<?php
}else{
?>
Login ok. Welcome <?php
echo "<meta http-equiv=Refresh content=3;url=1stpage.php>";
}
?>

I don't get any further. I must be missing something, but what??

Please help.

-Tore W-