Print PHP text string from info-URL

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HTML

PHP

So I have this URL that should inform the server with PHP language to get an image and text underneath.

<a href="foto_max.php?kart=foto_duczynski&foto=sztokholm_duczynski_00&temat=Stare miasto." target="_self">

I dont know almost nothing about PHP so I have this "kart=foto_duczynski" part left in the URL even though it does absoloutly nothing, but it looks that it was for specifying a folder that existed. I dont need that part in the URL because the foto "sztokholm_duczynski_00.jpg" is now moved by me to just the folder "foto".

Here is the part of the .php page that is the code in foto_max.php that brings the picture and text:

<?
if ($kart)
	$kartoteka = $kart;
else
	$kartoteka = "foto";
$foto = $kartoteka . "/" . $_GET['foto'] . ".jpg";
echo"

<table border='0' cellpadding='0' cellspacing='5'>
  <tr align=\"center\">
    <td width=\"770\" style=\"background: url('grafika/loading.gif') no-repeat top\">
	 	<img src='$foto' border=0><br>
	</td>
  </tr>
  <tr>
	<th width='770' height='19' bgcolor='#808040' class=\"top_menu\">
		$temat
	</th>
  </tr>
</table>
";


include("stopka.php");
?>

Here you can see the php-esque "$temat" which I think is what should be replaced by the string coming from the URL, in this case:

Stare miasto.

. You can see this string in the whole URL (again):

<a href="foto_max.php?kart=foto_duczynski&foto=sztokholm_duczynski_00&temat=Stare miasto." target="_self">

What should I add in the foto_max.php code so that the $temat code brings the string from the URL info?

What I have tried:

I have tried to change the URL with sending of php info to this URL:

<a href="foto_max.php?foto=sztokholm_duczynski_00&temat=Stare miasto." target="_self">

This made no change to get the string. However it made the code cleaner because that folder part didnt work anyway.