Template que funcione con el teclado

<ul class="navigation">   
<li class="prev button">        
<?php previous_post_link('%link', 'Previous'); ?>   
 </li>    <li class="next button">        
<?php next_post_link('%link', 'Next'); ?>    
</li>
</ul>

<script type="text/javascript">
$(document).ready(function () {  
  $(document).bind('keydown', 'left', function() {   
     var url = $('.prev a').attr('href');     
   if (url) {           
 window.location = url;    
    }  
  });    
$(document).bind('keydown', 'right', function() {  
      var url = $('.next a').attr('href');      
  if (url) {    
        window.location = url;    
    }  
  });
});
</script>