Look at the site using firebug or similar.
The site calls the piwik javascript at http://www.redxwebdesign.com/stats/piwik.php, but gets a 403 Forbidden response !
You must not protect that directory by password!
The “stats” directory isn’t password protected. I just went to that link and it says "Piwik is a free open source web analytics alternative to Google analytics." http://www.redxwebdesign.com/stats/piwik.php
I see.
When you call piwik.php without the tracking parameters, it is normal that you see that text.
What is not normal is the 403 response when called with all parameters.
Just by trial and error: If I delete the url-parts from the parameters (http://www…), then it works.
As the error comes from Apache and not piwik, I suspect, there is an anti-hacking configuration in your .htaccess, that does not permit an url like http://www.redxwebdesign.com/http://