I an working on a project and has encountered a problem. please view the following code. 

```
<iframe name="stus" id="stus" style="display:none;"></iframe>
<form name="water" id="water" method="post"  autocomplete="off" action="components/com_pocketsea/assets/new/water.php" target="stus">
<input type="hidden" id="newwatermark" name="newwatermark">
</form>  
<div id="posting"></div>

```

and the code for water.php is 

```
<?php
$newwat = $_POST['newwatermark'];
?>
<script type="text/javascript" src="../../js2/jquery.min.js" ></script>
<script>

 $(document).ready(function(){
$("#posting", window.parent.document).html("<?php echo $newwat; ?>").fadeIn('slow');

 });

</script>                         

```

plz help