need url solution

[eluser]Unknown[/eluser]
hi, my project link is as follow:

1)http://domainname.com/index.php/user
1)http://domainname.com/index.php/about
1)http://domainname.com/index.php/contact

but i want to show it without index.php like

1)http://domainname.com/user
1)http://domainname.com/about
1)http://domainname.com/contact

pls reply.