Help With Vbulletin Mod

Hello everybody,

I downloaded a plugin "thead thumbnail" and i uploaded it my plugins

the code :

<?xml version="1.0" encoding="ISO-8859-1"?>

<plugins>
	<plugin active="1" executionorder="5" product="vbulletin">
		<title>Thread Thumbnail</title>
		<hookname>forumdisplay_query</hookname>
		<phpcode><![CDATA[$tt_thumbsforums = array(8);
$tt_displaythumbs = false;

if (in_array($forumid,  $tt_thumbsforums)) {
	$tt_displaythumbs = true;
	$hook_query_fields .= ", attachment.thumbnail_filesize AS thumbsize , MIN(attachment.attachmentid) AS attachmentid ";
	$hook_query_joins .= "LEFT JOIN " . TABLE_PREFIX . "attachment as attachment ON(attachment.postid = thread.firstpostid AND (attachment.extension = 'jpg' OR attachment.extension = 'gif' OR attachment.extension = 'png')) ";
	$hook_query_where .= "GROUP BY thread.threadid ";
}]]></phpcode>
	</plugin>
	<plugin active="1" executionorder="5" product="vbulletin">
		<title>Thread Thumbnail - Search</title>
		<hookname>search_results_query_threads</hookname>
		<phpcode><![CDATA[$tt_displaythumbs = true;
	$hook_query_fields .= ", attachment.thumbnail_filesize AS thumbsize , MIN(attachment.attachmentid) AS attachmentid ";
	$hook_query_joins .= "LEFT JOIN " . TABLE_PREFIX . "attachment as attachment ON(attachment.postid = thread.firstpostid AND (attachment.extension = 'jpg' OR attachment.extension = 'gif' OR attachment.extension = 'png')) ";
	$hook_query_where .= "GROUP BY thread.threadid ";]]></phpcode>
	</plugin>
</plugins>

PHP:

I don'y know how to define in wich forum there have to be thread thumbnails.

Can someone help me please ?

Thank you.