Alternare colori tr

[las]

<?php

$db= @mysql_connect(localhost,username,password);
mysql_select_db(my_db, $db);
$result = mysql_query("SELECT *
FROM forum_threads
ORDER BY tid DESC
LIMIT 7" );

$colore="ff0000"; 
while ($records = mysql_fetch_assoc($result)) {
echo '<tr bgcolor="#$colore"><td>[url="http://sito.com/forum/showthread.php?tid=',$records['tid'],'"]'.$records['subject'].'[/url]</td></tr>';
echo  $records['message'];

($colore=="ff0000") ? $colore="00ff00": $colore="ff0000";
}  
?>