Problem: loading sub external swf

1

i have main.swf which loads usa.swf from sub folder “countries”, and it loads it perfectly


var ldr:Loader = new Loader();
var url:URLRequest = new URLRequest("countries/usa.swf");
ldr.load(url)
addChild(ldr)

and same technique, the usa.swf loads external swf in the same folder. and it loads it perfectly


var usa_ldr:Loader = new Loader();
var usa_url:URLRequest = new URLRequest("flag.swf");
usa_ldr.load(usa_url)
addChild(usa_ldr)

but, when i test from main.swf, i get this error:
Error #2044: Unhandled IOErrorEvent:. text=Error #2035: URL Not Found.

i read this thread:
Running Independent SWF

i tried:

var url:URLRequest = new URLRequest("countries/usa.swf");

var usa_url:URLRequest = new URLRequest("./flag.swf");

not one is working

Thanks in advance