I'm not entirely sure what you're asking or what your problem is. It is not possible for a SWF to access content from another domain unless that other domain gives permission. To do that you'll have create a crossdomain.xml file. Here are some good links about cross domain files:
http://www.cflex.net/showfiledetails.cfm?ChannelID=1&Object=addfile&objectID=287
And here is the crossdomain.xml file I use for The Flex Show Web site:
http://www.theflexshow.com/crossdomain.xml
<cross-domain-policy>
<site-control permitted-cross-domain-policies="all"/>
<allow-access-from domain="*"/>
<allow-http-request-headers-from domain="*" headers="*"/>
</cross-domain-policy>
This allows any Flash SWF to access content on theflexshow.com domain.
If this doesn't help address the issue, you're going to have to tell us exactly what your problem is.