[PHP-DB] Alternating rows pulled from database

[MrBaseball34]

I am trying to modify the XMB Forums to be more like
UBB in looks.

In this code, I want to alternate forum_index templates. 

I have created two templates, one using $altbg1 and one using $altbg2. I want 
to alternate the row colors... 

How would I accomplish that? 
{from: index.php} 

code:
while($group = $db->fetch_array($queryg)) {
  if($group[type] == "group") {
    eval("\$forumlist .= \"".template("index_category")."\";");
    if($catsonly != "on" || $gid) {
      $query = $db->query("SELECT * FROM $table_forums WHERE type='forum' 
                           AND status='on' AND fup='$group[fid]' ORDER BY 
                           displayorder");
      while($forum = $db->fetch_array($query)) {
        $forumlist .= forum($forum, "index_forum");
      }
    }
  }else {
    $forumlist .= forum($group, "index_forum");
  }
}


What I really need to do is something like this:

      $i = 0
      while($forum = $db->fetch_array($query)) {
        if ($i % 2 = 0 {
          $forumlist .= forum($forum, "index_forum");
        } else {
          $forumlist .= forum($forum, "index_forum2");
        }
        $i = $i + 1;
      }

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