Flash Form Not Working (Crossdomain.xml)

I have a site with a flash movie that has a search field and submit button in it. If you access the site by www.mysite.com – everything works fine. But, if you access the site by mysite.com – nothing happens when you click the submit button. And I’ve uploaded a crossdomain.xml file to the root directory.

The SWF is version 8 and the HTML code requires the version 7 plug-in to view. Also note that the flash movie uses GET to post the form data to a PHP page and uses the FULL URL, including “www.” as the URL to post to.

Any ideas? Thank you for your help!