small problems guy and girls...

I had a movieclip ( let's call it Mclip1 ) which i manually placed onto the main timeline of my swf. inside this clip i imported my an swf (myswf.swf) From my main timeline i could control myswf.swf by simply using something like
now i am adding the Mclip to the stage in this way

var Mclip:Loader = new Loader();
Mclip.loadBytes (bytes);
stage.addChild (Mclip);
problem is...i have no idea how to tell myswf.swf to gotoandplay(4)