Problem with my footer

gistfile1.html

<?php $article = $pages->find('blog')->children()->last() ?>
<?php $second = $article->prev() ?>
<?php $third = $second->prev() ?>

<div class="footer">
	<div class="container">
		<div class="grid full">
			<h3><?php echo html($article->title()) ?></h3>
			<small><?php echo html($article->Published()) ?></small>
			<p><?php echo excerpt($article->text(), 400) ?><a href="<?php echo html($article->url()) ?>"> Continue reading</a></p>
		</div>		
		<div class="cf"></div>
		<hr />
		<?php if($page->template()!='article') :?>
		<div id="next" class="grid half">		
			<p><a href="<?php echo html($second->url()) ?>"><?php echo html($second->title()) ?><br /><small><?php echo excerpt($second->description(), 60) ?></small></a></p>
		</div>		
		<?php elseif($page->template()=='article' and $page->hasNext()) :?>
		<div id="next" class="grid half">
			<p><a href="<?php echo $page->next()->url() ?>"><?php echo $page->next()->title() ?><br /><small><?php echo excerpt($page->next()->description(), 60) ?></small></a></p>
		</div>		
		<?php else : ?>
		<div id="next" class="grid half">
			&nbsp;
		</div>		
		<?php endif ?>		
		<?php if($page->template()!='article') :?>
		<div id="previous" class="grid half">		
			<p><a href="<?php echo html($third->url()) ?>"><?php echo html($third->title()) ?><br /><small><?php echo excerpt($third->description(), 60) ?></small></a></p>
		</div>		
		<?php elseif($page->template()=='article' and $page->hasPrev()) :?>
		<div id="previous" class="grid half">
			<p><a href="<?php echo $page->prev()->url() ?>"><?php echo $page->prev()->title() ?><br /><small><?php echo excerpt($page->prev()->description(), 60) ?></small></a></p>
		</div>		
		<?php else : ?>
		<div id="next" class="grid half">
			&nbsp;
		</div>		
		<?php endif ?>
		<div class="cf"></div>
	</div>
</div>