Security.allowDomain and crossdomain.xml problem

I have a Flash application that loads a bunch of images. The images that it loads are external .swf files. However, I get an error (security sandbox violation, I think) whenever I try to load them. My Flash application resides at root ([login to view URL]). The .swf images are located in a subdirectory ([login to view URL]). How do I give my Flash application permission to load .swf images that are in that subdirectory? I tried adding the line "[login to view URL]('[login to view URL]')" in each of the .swf file images. That didn't work. Does the problem also have anything to do with my [login to view URL] file? Help with this problem is appreciated.