problem parsing html as php with .htaccess

[wiktor]

Yes, normal .php files (in the same directory) are working fine. Exactly same content in .phtml file is giving Internal Server Error ;/

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OK, I think I have finally solved my problem. I had to alter apache conf file adding following line:
FCGIWrapper /var/www/fcgi/domain/php5-fcgi-starter .phtml

I did it in sites-available/ispcp.conf so I assume, I need to change it in templates as well. Am I right?

joximu, thanks for your help, really appreciate it!

Edit:
BTW, if I want to change smth in apache configuration, I need to alter all template files (als, dmn, sub) in /etc/ispcp/apache/parts ? And if I want to change smth in PHP configuration (php.ini) where is the template file for it?