Flash MX: Load external Movie

I am loading external *.swfs into a blank movie clip that sits in the main timeline of the master movie using the following code:

_root.loadMovie(“module1.swf”,“container”);

When the new movie loads, it seems to replace the entire master movie with the new *.swf. I want it to simply sit on top of the master…this is probably pretty obvious, but I appear to be missing something.

Any clues?

TIA
Shawn