Please HELP me!!

Hi guys..

I've tried anything... OK, almost anything, and I didn't manged to this right...

I've written this code:
<?php $fd=@fopen($my_file,"r");
if ($fd==FALSE)
{ echo "Error: can't open $my_file\n"; }
else
{ fscanf($fd,"%s %s",$var1,$var2);
fclose($fd); }
Bla bla, yada yada yada Bla bla, yada yada yada
Bla bla, yada yada yada
Bla bla, yada yada yada
?>

each time when I try to enter a URL to a file: http://www.my-site.com/myscript.php?my_file=http://www.geocities.com/anything/anything.txt I get the error message:"Error: can't open http://www.geocities.com/anything/anything.txt
I'll appreciate any comments..
thanx
anything

BTW - I forgot to say that the script runs on a UNIX system

Chances are that your server's security settings are such that you can't open remote files. Check the docs on fopen() at php.net for details.