General Support: Getting variables to display in a popup.php window

I have a popup.php file I'm using to open the larger images directly. I'm trying to get the image caption and description to display beneath the image in that window but have only succeeded in doing so with the date. But I don't understand why the rest isn't shown.

At the top of that page I have

<?php
include("plog-functions.php");
include("plog-globals.php");
global $inHead;
global $config;
?>

Then (after some other plogger code) in the body I have

print '<div class="datumplustitel"><h4>' .get_picture_date(). ': ' . get_picture_caption() . '</h4> - ' . get_picture_description() . '</div>';

The image is shown correctly, but the rest of the information is missing.

What else is needed to get that information 'transported' into that popup file?

... it's me again ;). I've decided to go for a popup only. The inline images looks really good, but I want to have the opportunity to show a larger image if necessary, and that would mean needing at least twice the amount of diskspace. And because I will have hundreds of photographs, the thumb leading directly to the large image is the better choice.

So my first question stands: how do I get the caption and description to show up in the popup?

Latest nightly.
I'm trying out things right now :), but with no succes yet.

This is what I came up with until now:

in the head:
<?php
include("plog-functions.php");
include("plog-globals.php");
?>

and in the body:

<?php
$baseurl = $config["baseurl"];
$src = $_REQUEST['src'];
$picture = get_picture_by_id($src);
$id = $picture["id"];

connect_db();
$sql = "SELECT * FROM `".$TABLE_PREFIX."pictures` WHERE id = $id";
$result = run_query($sql);
$row = mysql_fetch_assoc($result);

$thumbdir = $baseurl."images/".$picture['path'];
list($width, $height, $type, $attr) = getimagesize($thumbdir);
echo '
<script language="JavaScript">
<!--
this.resizeTo('.$width.'+80,'.$height.'+140);
-->
</script>';

$imagepath = $baseurl."images/".$picture['path'];
$imgtag = '<img class="photos" src="'.$imagepath.'" alt="'.$src.'"/>';
$output = $imgtag;
?>
<table width="100%" height="100%" cellspacing="0" cellpadding="0">
<tr><td valign="middle" align="center">
<a href="javascript:window.close();">
<?php
print $output;
print '<div class="datumplustitel"><h4>' .get_picture_date(). ': ' . get_picture_caption() . '</h4> - ' . get_picture_description() . '</div>';
?>
</a>