/* being meta descr hack */

	global $thread_meta_desc; // Make the variable global so we can access it from header.tmpl

	if ($obj->root_msg_id == $obj->id) // we only grab the message body from the root message of the thread
	{
		if ($obj->length > 200) // We want our desc to be max 200, seems like a good number
		{
			$thread_meta_desc_full = read_msg_body($obj->foff, $obj->length, $obj->file_id);
			$thread_meta_desc = strip_tags($thread_meta_desc_full);
			$thread_meta_desc = substr($thread_meta_desc, 0, 200);
			if(substr($thread_meta_desc, 0, strrpos($thread_meta_desc, ' '))!='') $thread_meta_desc = substr($thread_meta_desc, 0, strrpos($thread_meta_desc, ' '));
			} else {
			$thread_meta_desc = strip_tags(read_msg_body($obj->foff, $obj->length, $obj->file_id));
		}
	// Lets sanitize the message before we send it to the meta tag
	$thread_meta_desc = htmlspecialchars(strip_tags($thread_meta_desc));
	if(strlen($thread_meta_desc) < 10) $thread_meta_desc = $obj->subject; // if the message is shorter than 10 letters, we output the threads title as description
	}
  /* end meta desc hack */

<META NAME="description" CONTENT="{GVAR: FORUM_DESCR}">

<META NAME="description" CONTENT="{IF: $thread_meta_desc}{VAR: thread_meta_desc}{ELSE}{GVAR: FORUM_DESCR}{END}">