System.exactDomain Help

I need to access a PHP file which is in the sub-domain.

www.subdomain.mysite.com

My swf file is in the main domain

www.mysite.com

I am using SendAndLoad method, but i understand that with Flash 2004 it needs to be in the exact domain for it to work.

I searched some articles, which suggested me to use

System.exactDomain=false; on the first frame of the movie.

But it is not working. Any otherways you suggest?

http://livedocs.macromedia.com/flash/mx2004/main/wwhelp/wwhimpl/common/html/wwhelp.htm?context=Flash_MX_2004_Documentation&file=10_ext16.htm
http://www.macromedia.com/devnet/mx/flash/articles/fplayer_security_print.html