I didn't visit addurl.php for long time, but today i did and found this error on top of the page:
Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /home/domain/public_html/links/admin/database.php:1) in /home/domain/public_html/links/addurl.php on line 38

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/domain/public_html/links/admin/database.php:1) in /home/domain/public_html/links/addurl.php on line 38

Hmmm what i should be fixing now, i'm not sure. Any advice?

Check /admin/database.php on line 1 and make sure it is not showing any output. If possible post line 1 of database.php

line 1 was:
<?php
i change it to: <? and there is no error any more. Pffff this could be last thing i could guess as error?!?!
Problem fixed, thank you anyway...

Glad you fixed it. There may have been an unnecessary space after <?php which could have thrown out the error.

Yes there was space and i don't have idea how it could cosed error? But i'm glad i get it off