How to get the (cookie) Session Id into my JNLP

[Thomas Randall]

I've set up a file management website that requires authentication, which is working fine. I've now been asked to create a page for the user, once they've logged in, to launch a JNLP. My directions were to use the cookie information/authentication to upload a file into the users workspace.

I have been searching the web, since honestly, I'm a bit at a loss on how to start. From what I've read so far, I think I need to:
1. add the following parameters

 <property
      name="sid"
      value="$\{cookie['JSESSIONID'].value\}"/>
    <property
      name="serviceHost"
      value="<%=request.getServerName()%>"/>

2. ? This is where I'm stuck. I don't know how to get the cookie, to get the session and servername, to set those values. Is this a separate page/script, that's different from my page that I'm using to launch the JNLP? I have a page called remote.php, which looks like this:

<?php
header('Content-type: application/x-java-jnlp-file');
//header('Content-Disposition: attachment; filename="myws.jnlp"');

$base= "http://" . $_SERVER['HTTP_HOST'];
?>

<jnlp
  spec="1.5+"
  codebase="<?php print $base?>"
  href="remote.php"
    >
  <information>
    <title>Some Title</title>
    <vendor>Some Company</vendor>
    <homepage href="docs/help.html"/>
    <description>A Cool Application</description>
    <description kind="short">Remote data upload</description>
    <offline-allowed/>
    <icon href="remote-64.png"/>
    <icon kind="splash" href="remote-splash.png"/>
    <shortcut online="false">
      <desktop/>
      <menu submenu="Company Name"/>
    </shortcut>
  </information>
  <security>
      <all-permissions/>
  </security>
  <resources>
    <j2se version="1.6.0+" java-vm-args="-esa -Xnoclassgc"/>
    <jar href="remote.jar" download="eager"/>
    <jar href="set.jar" download="eager"/>
  </resources>
  <application-desc main-class="com.some.class.JavaClass"/>
</jnlp> 

Thank you for any/all help that you can provide!!