[PHP/JavaScript] 'OnClick' pour afficher .php

<div  id="maPage" style="visibility: hidden;">
   <?php include('maPage.php'); ?>
</div>

 <a href="#" onclick="afficherMaPage();">PLUS</a>

<script type="text/javascript">
   function afficherMaPage(){
      document.getElementById("paysage2").style.visibility = "visible";
   }
</script>