Custom URL rewriting

[eluser]shankar ganesh[/eluser]
In my .htaccess file it contains below lines,

Code:

Options +FollowSymLinks
RewriteEngine On

RewriteRule ^/rewrite$ http://wwa.jumpwebservice.com/ARG/system/application/controllers/testing/rewrite.php

In codeignitor,when i try to access the file rewrite.php using the below URL its not working.
http://wwa.jumpwebservice.com/ARG/system...ng/rewrite

how to access "rewrite.php" by giving "/rewrite" in URL and how to modify it in htaccess.