Thanx alot otheus, for these golden hints.

My first try will be that curl thing... Too bad I am a total noob with php.

From what I tried, this one seems to

- log me in propperly, and
- saves a cookies.txt, as a textfile, which seems to be valid and
- loads the exact page, where the go button is, and where all the parameters have to filled into the form.

I call it with: php curl.php > test.html
and If I open the test.html with my browser, I see the exact copy of the page

But now the next step would be, clicking to the go button somehow, and of course "filling out the form" befor clicking go.

There I am stuck now... I have no idea how to do that...

<?php
$username="test";
$password="test";
$cookie="cookies.txt";
$url="http://192.168.0.234/";
$postdata = "log=". $username ."&pwd=". $password ."&subm-cia=Log%20In&redir_to=". $url ."cia/edit.php?page=CIA.php";
$ch = curl_init();
curl_setopt ($ch, CURLOPT_URL, $url . "login-cia.php");
curl_setopt ($ch, CURLOPT_USERAGENT, "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)");
curl_setopt ($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt ($ch, CURLOPT_TIMEOUT, 60);
curl_setopt ($ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 0);
curl_setopt ($ch, CURLOPT_COOKIEJAR, $cookie);
curl_setopt ($ch, CURLOPT_REFERER, $url . "login-cia.php");
curl_setopt ($ch, CURLOPT_POSTFIELDS, $postdata);
curl_setopt ($ch, CURLOPT_POST, 1);
$result = curl_exec ($ch);
curl_close($ch);
echo $result;

exit;
?>

edit:
as far as I could research so far there are $_get and $_post ways to set variables. In my case $_get would be easy, as I could set the variables via the url. I now have to figure out how I can handle this if I have $_post is used here.