how to change "http://localhost/mysite/index.php to http://localhost/mysite/" after clicking on index page menu

[mahenda]

http://localhost/mysite/index.php to http://localhost/mysite/

http://localhost/mysite/about.php to http://localhost/mysite/about/

i'm using htaccess file and i;m able to get  this one here

http://localhost/mysite/about where is"/"?  

also how to change this one here

http://localhost/mysite/page?id=2

to

http://localhost/mysite/page/2

 

help

.htaccess

RewriteEngine on 
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}\.php -f
RewriteRule ^(.*)$ $1.php [NC,L]
php_flag register_globals 0
php_flag magic_quotes_gpc 0 
php_flag magic_quotes_runtime 0