Reload a javascript using jquery

Reload a javascript using jquery

I have made a PHP file that shows up a session meter for Joomla's frontend
using JavaScript. I have also made an other PHP file that shows the user's
details and it reloads using jQuery. What I want to do is, when I press
jQuery's reload button, JavaScript session meter reload too.
Session Meter PHP:
<?php // NO DIRECT ACCESS
defined('_JEXEC') or die('Restricted access');
$document = & JFactory::getDocument();
$document->addStyleSheet('***/***/session_meter.css');
include('***/***/scripts.php');
$document->addScriptDeclaration($javascript);
$output = array();
$session = & JFactory::getSession();
$expire = $session->getExpire();
$output[] = '<span id="log_res" class="">'.$expire.'</span>';
foreach ($output as $item){echo $item;}
?>
Session Meter javascript (part of it):
<?php // NO DIRECT ACCESS
defined('_JEXEC') or die('Restricted access');
$javascript = ' var timer_start =$time(); '."\n";
$javascript .= 'blah blah blah...
?>
User Profile JQuery script (part of it):
<?php // NO DIRECT ACCESS
defined('_JEXEC') or die('Restricted access'); ?>
<script>
var $JQ_ = jQuery.noConflict();
$JQ_(document).ready(function(){
$JQ_("#refresh_button").click(function(){$JQ_("#r_points").load('index.php
#r_points').fadeOut(1000).fadeIn(1000);});
});
</script>
I am trying to do something like this:
$JQ_("#refresh_button").click(function(){
$JQ_("#log_res").load('index.php #log_res').fadeOut(1000).fadeIn(1000);
});
but it only reloads session meter's span and not its JavaScript!
Any idea?