Query String Issue

Mornin',

I've been looking for an answer to my htaccess problem but I'm not particulary bright with htaccess so I'm hoping one of you out there can help. Basically I have an url:
http://www.domain.com?var=this

and I need it to go to:
http://www.domain.com?newvar=this

The problem I'm experiencing is the url i get is:
http://www.domain.com?var=this&newvar=this

From what I could gather the code is supposed to resemble:


Any help would be appreciated.

use this.

RewriteEngine On
RewriteBase /
RewriteCond %{QUERY_STRING} ^var=(.+)$ [NC]
RewriteRule ^.*$ ?newvar=%1? [QSA,L,R=301]