problem med .htaccess

Hejsa

Jeg har et webhotel, der køre med register_globals on, men jeg skal bruge dem off. Derfor laver jeg en .htaccess, og skriver:
php_flag register_globals off

Lægger den i roden af side, og tror det virker. Men jeg får en fejl 500:
Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, webmaster@xxxxx and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.



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Apache/1.3.27 Server at xxxxx Port 80