Loading movieclip help

hi, i need help (yes, again :D)

i want to load a movieclip into a blank movieclip once the root stops at a certain frame.

here is the code i have on the frame.

chosen = "mc1";

i wasnt sure how to give an instance name to a movieclip which isnt being used (only loaded) but i tried the linkage and called it mc1, it didnt work!
loader is the instance name of the blank movieclip.

any help would be great.