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Warning: include(mainfile.php) [function.include]: failed to open stream: No such file or directory in /home/prontopc/public_html/backend.php on line 15

Warning: include() [function.include]: Failed opening 'mainfile.php' for inclusion (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/prontopc/public_html/backend.php on line 15

Warning: Cannot modify header information - headers already sent by (output started at /home/prontopc/public_html/backend.php:15) in /home/prontopc/public_html/backend.php on line 17

Fatal error: Call to a member function sql_query() on a non-object in /home/prontopc/public_html/backend.php on line 28