you reference the target (into which the external swf loads)
movieclip in the preloader code to display preloader info about the
however, if you want to include this in the loading of the
_level0 (master) swf, you should add the external swf to your
_level0 swf, either in the library and attach it latter when needed
or drag it to the _level0 timeline when needed. it will then
download with the _level0 swf.