can`t get AI to work

[mawgaw]

I'm one step forward. - when called the page displays pictures but does not cache.
in his comment of 18. Jan 2012 matt wicox wrote:
"Open up the .htaccess file and replace

RewriteRule .(?:jpe?g|gif|png)$ adaptive-images.php

with

RewriteRule .(?:jpe?g|gif|png)$ test.jpg"

But in his instructions he writes
RewriteRule \ .(?:jpe?g|gif|png)$ adaptive-images.php

must I replace it with
RewriteRule .(?:jpe?g|gif|png)$ test.jpg ?

thankfull for an answer