Hello, I've got a singapore gallery running on my server with two diferent domains.

First domain mon-but.pl and second pazurki-szczecin.pl ...
The problem is with the second one...
http://pazurki-szczecin.pl is located in /monika folder instead of http://mon-but.pl which is located on root.
When i use my gallery address http://mon-but.pl/monika/images/index.php everything is alright, but when i use http://pazurki-szczecin.pl/images/index.php" i have an error return :

Warning: Unknown: open(/tmp/sess_8d024e6a20a9aabef80828adfe34b458, O_RDWR) failed: No such file or directory (2) in Unknown on line 0

Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/tmp) in Unknown on line 0

Please help me, how to use a href="images/index.php" in relative address in index.html placed on http://pazurki-szczecin.pl without any errors ... i need this because in other case my iframe doesn't resize itself properly.

P.S. when i login with address http://pazurki-szczecin.pl/images/admin.php i have the same error, but when i login using http://mon-but.pl/monika/images/admin.php everything is ok, no errors at all.