my .htaccess file is not working

[eluser]Sumon[/eluser]
Thanks, it's working fine. it's automatically add index.php. However, if i can hide index.php then i shall be more happy. Moreover, here is your answers:
1. question: Are you using PHP4 or PHP5?
Ans: PHP 5.2
2. question: Is your PHP running as a CGI or as an apache-module?
Ans: I am not sure. How can i be sure about it? However, i found a folder in root (through FTP) named CGI.

Sorry to say i don't have access of my php.ini.