Reset the modal reveal after close

Question

I have a modal in the template header.php:

<div id="modalRv">
   <?php echo $_SESSION['test']; ?>
   <a class='close'>Close</a>
</div>

This div is loaded only one time. In this template I do :

('a.close').on('click', function() {
    $('#modalRv').trigger('reveal:close');
});

In the .js I do :

('#modalRv').reveal({              //  The  item  which  will  be  opened  with  reveal
    animation: 'fade',             //  fade,  fadeAndPop,  none
    animationspeed: 600,           //  how  fast  animtions  are
    closeonbackgroundclick: true,  //  if  you  click  background  will  modal  close?
    dismissmodalclass:  'close'    //  the  class  of  a  button  or  element  that  will  close  an  open  modal
});

The idea is that template is loaded only one time but the value of $_SESSION['test'] change for each call, but i get only the value of start. I tried to do :

$('#modalRv').html("");

but the same situation. Sorry for my english. Thx in advance