a simple script needed
 

can anyone point me to a script, or help me figure out what Im doing wrong.
I need a "random gallery" script that will do the following.

I enter in a url such as:
http://www.domainname.com/galleries.php?=123456

now the galleries.php file will access another file called galls.
There will be 20 galleries in there.
It will pick a random gallery and add the "123456" code above to a variable in the file.

the galls file will be setup like
http://www.domain1.com/linkcode=refer code
http://www.domain2.com/linkcode=refer code
http://www.domain3.com/linkcode=refer code
etc

so when I enter in
http://www.domainname.com/galleries.php?=123456
it will go to the galls file, and replace the "refer code"
with the 123456 which is at the end of
http://www.domainname.com/galleries.php?=123456

so if I change 123456 to 444444 it will change the refer code on the output of the random gallery.

Im using a php based script, but i'll use cgi if someone can show me the way.

cut n paste from elsewhere.. I'm looking into this as well to see if there is a better way.


gallery.php contain the next script to select an random link from gallery.txt

$fileName = "gallery.txt";
mt_srand( (double) microtime() * 1000000 );
$a = file($fileName);
$randNum = mt_rand( 0, sizeof($a)-1 );
header( "Location: ". $a[$randNum] );
?>

gallery.txt contain for example next 3 links:
site3.com/linkgallery1.html
site3.com/linkgallery2.html
site3.com/linkgallery3.html