crossdomain.xml

Hi,

I'd like to use the ability of jw player to put in playlist the content of a rss feed, i thought it could be an easy way to spead podcasts contents on other sites...but it apparently needs an xml file named crossdomain.xml to authorize Flash to read datas from a different domain.
I tried in /Library/WebServer/Documents and restarted web, and tried also in /PodcastProducerContents/Podcasts (but didn't know what to reboot)..But it doesn't work..Does anyone knows where and how put this file ?

Thanks in advance, Julien