Changing colour of movieclip

I have this piece of actionscript working



var my_color = new Color("mymc");
my_color.setRGB(0xFF0000);


This works when I call the actionscript say from a button on the same timeline as the movieclip. What I can’t get my head round is how I change the colour of an object on a different timeline, say if the path to the movieclip was _root.mc1.mc2.mymc

What would be the actionscript then?