Создание зебры

zebra.php

{*На smarty*}
<table>
<thead>
<tr>
   <th>Header</th>
</tr>
</thead>
 <tbody>

{foreach from=$items item=item name=foo}
    <tr {if $smarty.foreach.foo.index % 2}class="even"{/if}>
       <td>Lorem ipsum dolor sit amet</td>
    </tr>
 {/foreach}
 </tbody>
</table>

<?php
//на php
            echo '<table width="100%" cellpadding="0" cellspacing="0" border="0" class="us_tbl"><tr class="headline"><th>Название</th>';
            $cont=0;
            foreach($lists as $key=>$list){
                if ($cont % 2 == 0) {
                    $class='even';
                } else {
                    $class='gray';
                }
                echo '<tr class='.$class.'><td>'.$list['title'].'</td>';
                $cont++;
            }
            echo "</table>";