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    Hi Rowdie,
thanks for prompt Answer.
Yes I have change XOOPS_URL - the XOOPS_ROOT_PATH it the same.
With this settings it work without problems.
 // XOOPS Virtual Path (URL)
 // Virtual path to your main XOOPS directory WITHOUT trailing slash
 // Example: define('XOOPS_URL', 'http://xoops.pl');
 define('XOOPS_URL', 'http://mirc.home.pl/xoops');
 #define('XOOPS_URL', 'http://www.xoops.pl'); 
With this not :(
 // XOOPS Virtual Path (URL)
 // Virtual path to your main XOOPS directory WITHOUT trailing slash
 // Example: define('XOOPS_URL', 'http://xoops.pl');
 #define('XOOPS_URL', 'http://mirc.home.pl/xoops');
 define('XOOPS_URL', 'http://www.xoops.pl'); 
This is only one change that I made.
If you go to 
http://mirc.home.pl/xoops you can see that script work (site at work message). 
But when you go direct to xoops.pl - it bringt only errors.
Thanks
dap