Drupal "odd" & "even" Class

Gunakan variable $zebra, misal:

<div class="comment<?php print ($comment->new) ? ' comment-new' : ''; print ' '. $status ?> clear-block">

menjadi

<div class="comment<?php print ($comment->new) ? ' comment-new' : ''; print ' '. $status; print ' '. $zebra ?> clear-block">