Small help in .htaccess with PHP URL rewrite

Hi
all i need a small help i have URL like this http://www.websitename.com/index.php?pageid now i want this URL like this http://www.websitename.com/pageid/ can any one provide me htaccess code for it

currently i have htaccess file with this code its for www setings
===================
RewriteEngine on
RewriteCond %{HTTP_HOST} !^www
RewriteRule (.*) http://www.%{HTTP_HOST}/$1 [L,R=301]
==================

Thanks

 

add

RewriteRule /pageid/ http://www.websitename.com/index.php?pageid [L]

Code (markup):

works perfectly

 

Here is .htaccess file