[PHP/MySQL] Problem z zapytaniem do SQL i pętla Opcje

[servs]

Witam!
Nie wiem co jest nie tak w kodzie... Wywala mi taki błąd:

Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, root@localhost and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.


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Apache/2.0.59 (Win32) PHP/5.2.3 Server at localhost Port 80

A kod mam taki:

[PHP] pobierz, plaintext 
<?php
$x=mysql_query("SELECT `name`, `id` FROM `category_root`");
while ($row=mysql_fetch_array($x)) {
$y=mysql_query("SELECT `name` FROM `category_up` WHERE `root_id` =$row['id']");
$row1=mysql_fetch_array($y);
echo $row['name'];
echo '<br>';
echo $row1['name'];
 }
mysql_close();
?>
[PHP] pobierz, plaintext 

Co w tym kodzie jest nie tak?

Pozdrawiam!