Remove all php commands from .htaccess and put in the php.ini file. suPHP does not allow php commands in .htaccess (server 500 error).

.htaccess (in Dolphin) comes with one php instruction at the top of the file. Remove it (see above)

If your using php5 put this in .htaccess:
# Use PHP5 as default
AddHandler application/x-httpd-php5 .php