How can i controll my main swf file from loaded swf

In my main swf, I m loading 1 swf file which is having 1 mc and in that there is 1 btn.

what i want is when a user will click this btn of my loaded swf i want to move to another scene of my main swf.

How can i do it? I tried to search the ans in forum bt could not trace out.

this is bit urgent so if some can help me out in this.

many thx in advance.