.htaccess rewrite rule

Hi,

I need my webpage to be redirected from <mydomainname>/store?<somequery> to <mydomainname>/?<somequery>

I am trying to modify the .htaccess file. For example, I tried adding this code

RewriteRule ^store <mydomainname>/

and it didn't work. By <mydomainname> I mean the location of the website.

Here is mod_rewrite code in .htaccess

<IfModule mod_rewrite.c>

############################################
## enable rewrites

Options +FollowSymLinks
RewriteEngine on


############################################
## you can put here your magento root folder
## path relative to web root

RewriteBase /domainname/public_html/


############################################
## workaround for HTTP authorization
## in CGI environment

RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]

############################################
## always send 404 on missing files in these folders

RewriteCond %{REQUEST_URI} !^/(media|skin|js)/


############################################
## never rewrite for existing files, directories and links

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-l

############################################
## rewrite everything else to index.php

RewriteRule .* index.php [L]

</IfModule>


############################################
## Prevent character encoding issues from server overrides
## If you still have problems, use the second line instead

AddDefaultCharset Off
#AddDefaultCharset UTF-8

<IfModule mod_expires.c>

############################################
## Add default Expires header
## http://developer.yahoo.com/performance/rules.html#expires

ExpiresDefault "access plus 1 year"

</IfModule>