<?php $i = 0;
    foreach ($countries as $k => $v): ?>

    <?php  if ($i % 5 == 4){
         $class = 'last';
    }else{
        $class= '';
    } ?>

    <a href="<?php echo $this->Html->url($v['Country']['link']); ?>"class="box <?php echo $class; ?>">

        <span>
            <p>
                <?php echo $v['Country']['name']; ?>
            </p>
        </span>
        <?php $img = current($v['Media']); ?>

    <?php echo $this->Html->image(sprintf($img['filef'],140,138)); ?>
    </a>

<?php
    $i++;
    endforeach;
?>
<div style="clear:both"></div>