Cannot modify header information

I changed the title of the site in /inc/header.inc.php and after that I got following error messages:

Warning: Cannot modify header information - headers already sent by (output started at /xxxxx/xxxxx/xxxxx/community/inc/header.inc.php:353) in /xxxxx/xxxxx/xxxxx/community/inc/design.inc.php on line 643

Further  I cannot login to the admin section

Thanks for your help

Make everytime you change a code file a backup from it!!!

have you checked that there is no space under the last code. Or that you are missing the " ; " behind the changed code. 

Mostly this are the problems who give this sort of errors.

Like killerhaai said, don't forget this

$site['title'] = 'Site Title';

But I can't get it to show the red color in my text editor?  Does the red make a difference? 

:))

The code was like this $site['title'] = 'Site Title'; This was not the problem and I found no solution. I have now installed all new and will backup all files in the future. Thanks for your help!